JPH0120675Y2 - - Google Patents
Info
- Publication number
- JPH0120675Y2 JPH0120675Y2 JP1980001644U JP164480U JPH0120675Y2 JP H0120675 Y2 JPH0120675 Y2 JP H0120675Y2 JP 1980001644 U JP1980001644 U JP 1980001644U JP 164480 U JP164480 U JP 164480U JP H0120675 Y2 JPH0120675 Y2 JP H0120675Y2
- Authority
- JP
- Japan
- Prior art keywords
- detector
- metal pipe
- liquid passage
- liquid
- particles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000002245 particle Substances 0.000 claims description 46
- 239000002184 metal Substances 0.000 claims description 37
- 239000007788 liquid Substances 0.000 claims description 35
- 239000008188 pellet Substances 0.000 claims description 10
- 229920003002 synthetic resin Polymers 0.000 claims description 4
- 239000000057 synthetic resin Substances 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 239000000725 suspension Substances 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 210000000601 blood cell Anatomy 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229930182556 Polyacetal Natural products 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- -1 blood cells Substances 0.000 description 1
- 210000001772 blood platelet Anatomy 0.000 description 1
- 210000003743 erythrocyte Anatomy 0.000 description 1
- 230000000415 inactivating effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Landscapes
- Investigating Or Analysing Biological Materials (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、液体に浮懸する血球などの粒子を微
細孔に通過させ、液と粒子との電気インピーダン
スの差異に基づいて検出する粒子計数装置の検出
器に関するもので、検出器の試料吸引パイプとし
て内径の小さい金属製パイプを用いて内部電極を
兼用させ、電蝕などによる検出不良などが生じる
のを防止して、２種以上の大きさの異なる粒子を
効果的に検出するのに適する検出器を提供せんと
するものである。[Detailed description of the invention] [Industrial application field] This invention is a particle counting method in which particles such as blood cells suspended in a liquid are passed through micropores and detected based on the difference in electrical impedance between the liquid and the particles. This relates to the detector of the device, and uses a metal pipe with a small inner diameter as the sample suction pipe of the detector, which also serves as the internal electrode, to prevent detection failures due to electrolytic corrosion, etc. The present invention aims to provide a detector suitable for effectively detecting particles of different sizes.
従来から、血球などの粒子を計数する場合、液
体に浮懸する血球などの粒子を検出器の微細孔に
通過させ、液と粒子との電気インピーダンスの差
異に基づいて検出し、これを電気パルス信号に変
換して粒子に相当するパルス信号を計数する粒子
計数装置が用いられている。
Conventionally, when counting particles such as blood cells, particles such as blood cells suspended in a liquid are passed through fine holes in a detector, detected based on the difference in electrical impedance between the liquid and the particles, and then detected using an electric pulse. A particle counting device is used that converts pulse signals into signals and counts pulse signals corresponding to particles.
この粒子計数装置においては、微細孔の裏側で
すでに吸引された前回、前々回あるいは今回の試
料の巻込みによつて不要なパルス信号を発生させ
るという現象が生じていた。とくにこの現象は、
微細孔の近辺の検出領域内に大小の入り混じつた
粒子が巻き込まれ、大きい方の粒子によるパルス
があたかも小さい粒子が微細孔を通過したときと
同じようなパルスを発生し、たとえば赤血球と血
小板のような大小の粒子を同時に微細孔を通過さ
せ、出力パルスの大きさの違いから分類計数を行
う際などに大きな誤差を与えるという欠点があつ
た。
In this particle counting device, a phenomenon has occurred in which an unnecessary pulse signal is generated due to the entrainment of the previous sample, the sample before the previous sample, or the current sample that has already been aspirated on the back side of the fine hole. In particular, this phenomenon
A mixture of large and small particles gets caught up in the detection area near the micropore, and the pulse from the larger particle generates a pulse similar to when a small particle passes through the micropore, e.g., red blood cells and platelets. This method has the disadvantage that large and small particles such as these are forced to pass through the micropores at the same time, resulting in large errors when performing classification and counting due to the difference in the size of the output pulse.
上記の現象を防止するために、検出器の微細孔
の裏側を２重構造として微細孔を通過した粒子を
すべて吸引してしまう方法や、あるいは粒子を含
む液体の流れを粒子を含まない液体で包み込んで
微細孔を通過させ、巻込み現象が生じない構造と
するなどの方法が考えられるが、構造がきわめて
複雑となり、また吸引した液体の定量が不可能と
なつたりする欠点があつた。 In order to prevent the above phenomenon, there is a method to create a double structure on the back side of the fine pores of the detector to suck out all the particles that have passed through the fine pores, or to replace the flow of liquid containing particles with liquid that does not contain particles. One possible method is to wrap the liquid and pass it through micropores to create a structure that does not cause the entrainment phenomenon, but this has the disadvantage that the structure becomes extremely complicated and it becomes impossible to quantify the sucked liquid.
本考案は上記の諸点に鑑みなされたもので、簡
単な構造で正確に検出することができる粒子計数
装置の検出器を提供することを目的とするもので
ある。 The present invention was developed in view of the above points, and an object of the present invention is to provide a detector for a particle counting device that has a simple structure and is capable of accurate detection.
本考案の粒子計数装置の検出器は、合成樹脂製
の検出器本体１内に内径の小さい金属製パイプ２
を嵌設し、この金属製パイプの一端に微細孔３を
有する検出器ペレツト４をこの微細孔と金属製パ
イプ内部とが連通するように当接して、この検出
器ペレツト４を細孔５を有するカバー６により押
圧、固定し、一方、前記検出器本体１の他端を中
央部に細い液体通路７を有する電極取出用の金具
８にパツキングを介して固定するとともに、前記
金属製パイプ２をこの液体通路７に連通させ、さ
らに金具８を縦方向中央部に細い液体通路を有す
る検出器本体上部１４に、この金具８の液体通路
７と検出器本体上部１４の液体通路とが連通する
ようにパツキングを介して固定し、この液体通路
を吸引圧力源に接続して、金属製パイプ２を試料
吸引パイプ兼内部電極としたことを特徴としてい
る。
The detector of the particle counting device of the present invention has a metal pipe 2 with a small inner diameter inside a detector body 1 made of synthetic resin.
A detector pellet 4 having a fine hole 3 is brought into contact with one end of this metal pipe so that the fine hole communicates with the inside of the metal pipe. On the other hand, the other end of the detector main body 1 is fixed via packing to a metal fitting 8 for taking out an electrode, which has a narrow liquid passage 7 in the center, and the metal pipe 2 is The metal fitting 8 is connected to the liquid passage 7, and the liquid passage 7 of the metal fitting 8 and the liquid passage of the upper part 14 of the detector body are connected to the upper part 14 of the detector body, which has a thin liquid passage in the center in the vertical direction. The liquid passageway is connected to a suction pressure source so that the metal pipe 2 serves as a sample suction pipe and an internal electrode.
液体通路７に吸引圧を与えると、検出器ペレツ
ト４の微細孔３を通じて粒子懸濁液が吸引され
る。試料吸引パイプ兼内部電極である金属製パイ
プ２が検出器ペレツト４に隣接して位置するた
め、検出領域がきわめて小さく、微細孔３を粒子
が通過する際に金属製パイプ側に入ると、もはや
検出領域を出てしまつて出力パルスは生じなくな
る。したがつて粒子の巻込み現象などによる不要
なパルスが生じなくなる。
When suction pressure is applied to the liquid passageway 7, the particle suspension is sucked through the micropores 3 of the detector pellet 4. Since the metal pipe 2, which serves as the sample suction pipe and internal electrode, is located adjacent to the detector pellet 4, the detection area is extremely small. After leaving the detection area, no output pulse is generated. Therefore, unnecessary pulses due to particle entrainment phenomena are no longer generated.
以下、本考案の実施例を図面に基づいて説明す
る。１はポリアセタールなどの合成樹脂の成形品
からなる検出器本体で、この検出器本体１内にス
テンレススチールなどの耐蝕性金属からなり、内
径が0.5〜１mm程度の細い金属製パイプ２が埋め
込まれている。この金属製パイプ２および検出器
本体１の下端に、直径60〜100ミクロン程度の微
細孔３を有する検出器ペレツト４が、この微細孔
３と金属製パイプ２内部とが連通するように当接
されて、この検出器ペレツト４を細孔５を有する
キヤツプ状のカバー６により押圧、固定してい
る。第１図においては、キヤツプ状のカバー６と
検出器本体１下部とをねじ止めにより固定する場
合を示しているが、他の方法たとえば密に嵌合す
る方法などを採用することも可能である。一方、
前記検出器本体１の上端は中央部に細い液体通路
７を有する金具８に固定されるとともに、前記金
属製パイプ２の上端はこの液体通路７に連通して
いる。金属製パイプ２は前述のように内径が0.5
〜１mm程度の細いパイプであるので、吸引された
試料は速やかに排除されるとともに、内部電極を
兼ねている。この内部電極を兼ねた金属製パイプ
２は、金具８と電気的にも接続状態にあり、金具
８に設けられた端子１０を介して外部へ取り出さ
れる。さらに前記液体通路７は下記のような構成
により吸引圧力源に接続されている。すなわち金
具８の上部は、可撓性を有するダイアフラム１１
を介して上下に隣接する２つの液溜め用の空間１
２，１３（下方の空間を１２、上方の空間を１３
とする）を有する検出器本体上部１４に、液体通
路７が下方の空間１２に連通するように固定され
ている。この下方の空間１２は通路１５および電
磁弁１６などを介して排液溜めおよび吸引圧力源
へ接続され、一方、上部の空間１３は通路１７を
介して液体定量装置へ接続されている。なお検出
器本体上部１４は、検出器本体１と同様にポリア
セタールなどの合成樹脂で形成される。また第１
図においては、検出器本体１上部と金具８下部、
金具８上部と検出器本体上部１４をねじ止めによ
り固定する場合を図示しているが、他の方法たと
えば密に嵌合する方法などを採用することも可能
である。なお金属製パイプは腐蝕や電蝕に対処す
るために厚肉のものを用いるのが望ましい。
Hereinafter, embodiments of the present invention will be described based on the drawings. Reference numeral 1 denotes a detector body made of a molded product of synthetic resin such as polyacetal. Inside this detector body 1 is embedded a thin metal pipe 2 made of a corrosion-resistant metal such as stainless steel and having an inner diameter of about 0.5 to 1 mm. There is. A detector pellet 4 having a fine hole 3 with a diameter of about 60 to 100 microns is brought into contact with the lower end of the metal pipe 2 and the detector body 1 so that the fine hole 3 and the inside of the metal pipe 2 communicate with each other. The detector pellet 4 is then pressed and fixed by a cap-like cover 6 having pores 5. Although FIG. 1 shows the case where the cap-shaped cover 6 and the lower part of the detector main body 1 are fixed by screws, it is also possible to adopt other methods, such as a method of tightly fitting them. . on the other hand,
The upper end of the detector main body 1 is fixed to a metal fitting 8 having a narrow liquid passage 7 in the center thereof, and the upper end of the metal pipe 2 communicates with this liquid passage 7. As mentioned above, the metal pipe 2 has an inner diameter of 0.5
Since it is a thin pipe of about 1 mm, the sucked sample is quickly removed, and it also serves as an internal electrode. The metal pipe 2, which also serves as an internal electrode, is electrically connected to the metal fitting 8 and is taken out to the outside via a terminal 10 provided on the metal fitting 8. Further, the liquid passage 7 is connected to a suction pressure source by the following configuration. That is, the upper part of the metal fitting 8 is a flexible diaphragm 11.
Space 1 for two liquid reservoirs adjacent above and below through
2, 13 (12 for the space below, 13 for the space above)
A liquid passageway 7 is fixed to an upper part 14 of the detector body having an upper part 14 (hereinafter, referred to as a "detector body") such that the liquid passage 7 communicates with the space 12 below. This lower space 12 is connected via a passage 15 and a solenoid valve 16 etc. to a drain reservoir and a source of suction pressure, while the upper space 13 is connected via a passage 17 to a liquid metering device. Note that the detector main body upper part 14 is formed of synthetic resin such as polyacetal similarly to the detector main body 1. Also the first
In the figure, the upper part of the detector main body 1, the lower part of the metal fitting 8,
Although the upper part of the metal fitting 8 and the upper part of the detector body 14 are shown fixed by screws, it is also possible to employ other methods such as a method of tightly fitting them. Note that it is desirable to use thick-walled metal pipes to protect against corrosion and electrolytic corrosion.
つぎに上記のように構成された本考案の検出器
を備えた粒子計数装置の一例を第２図に基づいて
説明する。１８は検出器の下側の空間に通路１５
および電磁弁１６を介して接続された液体移送制
御装置で、この液体移送制御装置１８はさらに試
料容器２０の試料入口２１および試料出口２２に
接続されて、粒子懸濁液２３の移送や検出器内部
からの試料の吸引、排出を制御するための装置で
ある。２４は検出器の上側の空間に通路１７を介
して接続された液体定量装置で、検出器下端の微
細孔を通じて吸引される粒子懸濁液の定量を行う
ための装置である。２５は内部電極および外部電
極２６に接続された検出回路で、この検出回路２
５にはアツパーレベルの閾値回路２７が接続され
て大きい方の粒子によるパルスを通過させる。ま
た検出回路２５にはアツパーレベルの閾値回路２
７の禁止信号に同期させるための遅延回路２８が
接続され、アツパーレベルの閾値回路２７の粒子
信号に達したときにはパルスの通過をつぎのロー
レベルの閾値回路３０を不作動化させて阻止す
る。同時にノイズなどの小さい信号の通過を阻止
する。３１はアツパーレベルを通過した信号の計
数回路、３２はローレベルの信号の計数回路、３
３はそれぞれの計数回路３１，３２の計数値に基
づいて補正演算を行う演算回路、３４は大きい粒
子の計数結果を表示する表示回路、３５は小さい
粒子の計数結果を表示する表示回路である。 Next, an example of a particle counting device equipped with the detector of the present invention configured as described above will be explained based on FIG. 2. 18 is a passage 15 in the space below the detector.
The liquid transfer control device 18 is further connected to the sample inlet 21 and sample outlet 22 of the sample container 20 to transfer the particle suspension 23 and the detector. This is a device for controlling the suction and discharge of samples from inside. 24 is a liquid quantification device connected to the space above the detector via a passage 17, and is a device for quantifying the particle suspension sucked through the fine hole at the lower end of the detector. 25 is a detection circuit connected to the internal electrode and the external electrode 26;
5 is connected to an upper level threshold circuit 27 to pass pulses due to larger particles. The detection circuit 25 also includes an upper level threshold circuit 2.
A delay circuit 28 is connected to synchronize with the inhibition signal No. 7, and when the particle signal of the upper level threshold circuit 27 is reached, the passage of the pulse is blocked by inactivating the next low level threshold circuit 30. . At the same time, it blocks small signals such as noise from passing through. 31 is a counting circuit for signals passing through the upper level; 32 is a counting circuit for low level signals; 3
3 is an arithmetic circuit that performs a correction calculation based on the counts of the respective counting circuits 31 and 32; 34 is a display circuit that displays the counting results of large particles; and 35 is a display circuit that displays the counting results of small particles.
上記のように構成された粒子計数装置を用いて
粒子懸濁液中の粒子の検出を行うには、上方の空
間１３に吸引圧を与え、ダイアフラム１１を介し
て検出器内部を吸引圧とすると、検出器ペレツト
４の微細孔３を通じて粒子懸濁液が吸引され、こ
れを液体定量装置２４で定量し、スタート・スト
ツプ信号を発生させ計数開始および計数停止を行
う。測定後は下方の空間１２に吸引圧力を与えて
ダイアフラム１１を復帰させると同時に、検出器
内部の液を外部へ排出させる。本考案の検出器は
金属製パイプが検出器ペレツトの直後に隣接して
位置するために、検出領域がきわめて小さく、微
細孔を粒子が通過する際に金属製パイプ側に入る
と、もはや検出領域を出てしまつて出力パルスは
生じなくなる。したがつて粒子の巻込み現象など
による不要なパルスが生じなくなる。 In order to detect particles in a particle suspension using the particle counting device configured as described above, a suction pressure is applied to the upper space 13 and the inside of the detector is brought into suction pressure through the diaphragm 11. A particle suspension is sucked through the fine holes 3 of the detector pellet 4, and is quantified by the liquid metering device 24, and a start/stop signal is generated to start and stop counting. After measurement, suction pressure is applied to the lower space 12 to return the diaphragm 11 and at the same time discharge the liquid inside the detector to the outside. In the detector of this invention, the metal pipe is located immediately behind and adjacent to the detector pellet, so the detection area is extremely small. , and no output pulse is generated. Therefore, unnecessary pulses due to particle entrainment phenomena are no longer generated.
上記のように構成された粒子計数装置におい
て、演算回路３３の補正演算は以下の式に基づい
て行われる。 In the particle counting device configured as described above, the correction calculation of the calculation circuit 33 is performed based on the following equation.
小さい粒子数＝小さい粒子の計数値−（a0−a1
×大きい粒子数−a2×前回の大きい粒子数−a3×
前々回の大きい粒子数−…）
ここでa0，a1，a2…は係数であり、検出器の構
造や形状などによつて異なる値である。本実施例
におけるように、検出器の金属製パイプの内径を
１mm以下にし、前回の試料が速やかに排出される
構造の検出器を使用すると、a2以下は無視できる
程小さくなり、かつ初めの数秒間は今回の試料を
吸引するために、検出器の微細孔の裏側は今回の
試料のみで満たされるようになる。したがつて
小さい粒子数＝小さい粒子の計数値−（a0−a1
×大きい粒子数）
として計数することができる。 Number of small particles = count value of small particles - (a 0 − a 1
× Number of large particles − a 2 × Number of previous large particles − a 3 ×
The number of large particles before the previous time -...) Here, a 0 , a 1 , a 2 ... are coefficients, and the values differ depending on the structure and shape of the detector. As in this example, if the inner diameter of the metal pipe of the detector is set to 1 mm or less, and a detector is used that has a structure in which the previous sample is quickly discharged, a2 or less becomes negligibly small, and the initial For several seconds, the current sample is sucked in, so the back side of the fine hole in the detector is filled only with the current sample. Therefore, the number of small particles = the count value of small particles - (a 0 − a 1
x number of large particles).
以上説明したように、本考案の検出器は内径が
細いので前回の試料が速やかに排出され、また内
部電極を金属製パイプが兼ねているので、電極表
面積が大きくなりかつ微細孔近くまで電極を近づ
けることができ、ノイズや電気化学現象などに対
して有効で正確な検出、測定ができるという効果
を有している。
As explained above, the detector of the present invention has a small inner diameter so that the previous sample can be quickly discharged, and since the internal electrode is also a metal pipe, the electrode surface area is large and the electrode can be inserted close to the micropore. It has the effect of being able to be brought close to the sensor, enabling effective and accurate detection and measurement of noise, electrochemical phenomena, and the like.
第１図は本考案の粒子計数装置の検出器の一実
施例を示す断面説明図、第２図は本考案の検出器
を備えた粒子計数装置の一例を示す系統的説明図
である。
１……検出器本体、２……金属製パイプ、３…
…微細孔、４……検出器ペレツト、５……細孔、
６……カバー、７……液体通路、８……金具、１
０……端子、１１……ダイアフラム、１２，１３
……空間、１４……検出器本体上部、１５……通
路、１６……電磁弁、１７……通路、１８……液
体移送制御装置、２０……試料容器、２１……試
料入口、２２……試料出口、２３……粒子懸濁
液、２４……液体定量装置、２５……検出回路、
２６……外部電極、２７……閾値回路、２８……
遅延回路、３０……閾値回路、３１，３２……計
数回路、３３……演算回路、３４，３５……表示
回路。
FIG. 1 is a cross-sectional explanatory diagram showing one embodiment of the detector of the particle counting device of the present invention, and FIG. 2 is a systematic explanatory diagram showing an example of the particle counting device equipped with the detector of the present invention. 1...Detector body, 2...Metal pipe, 3...
...micropore, 4...detector pellet, 5...pore,
6...Cover, 7...Liquid passage, 8...Metal fittings, 1
0...Terminal, 11...Diaphragm, 12, 13
... Space, 14 ... Upper part of the detector main body, 15 ... Passage, 16 ... Solenoid valve, 17 ... Passage, 18 ... Liquid transfer control device, 20 ... Sample container, 21 ... Sample inlet, 22 ... ... Sample outlet, 23 ... Particle suspension, 24 ... Liquid quantitative device, 25 ... Detection circuit,
26... External electrode, 27... Threshold circuit, 28...
Delay circuit, 30... Threshold circuit, 31, 32... Counting circuit, 33... Arithmetic circuit, 34, 35... Display circuit.
Claims (1)
属製パイプ２を嵌設し、この金属製パイプの一端
に微細孔３を有する検出器ペレツト４をこの微細
孔と金属製パイプ内部とが連通するように当接し
て、この検出器ペレツト４を細孔５を有するカバ
ー６により押圧、固定し、一方、前記検出器本体
１の他端を中央部に細い液体通路７を有する電極
取出用の金具８にパツキングを介して固定すると
ともに、前記金属製パイプ２をこの液体通路７に
連通させ、さらに金具８を縦方向中央部に細い液
体通路を有する検出器本体上部１４に、この金具
８の液体通路７と検出器本体上部１４の液体通路
とが連通するようにパツキングを介して固定し、
この液体通路を吸引圧力源に接続して、金属製パ
イプ２を試料吸引パイプ兼内部電極としたことを
特徴とする粒子計数装置の検出器。 A metal pipe 2 with a small inner diameter is fitted into a detector body 1 made of synthetic resin, and a detector pellet 4 having a fine hole 3 at one end of this metal pipe is communicated with the inside of the metal pipe. The detector pellet 4 is pressed and fixed by a cover 6 having a fine hole 5, while the other end of the detector body 1 is connected to a cover 6 having a thin liquid passage 7 in the center for taking out the electrode. The metal pipe 2 is fixed to the metal fitting 8 through packing, the metal pipe 2 is connected to the liquid passage 7, and the metal fitting 8 is attached to the upper part 14 of the detector body, which has a narrow liquid passage in the longitudinal center. Fixed via packing so that the liquid passage 7 and the liquid passage in the upper part 14 of the detector main body communicate with each other,
A detector for a particle counting device characterized in that the liquid passage is connected to a suction pressure source, and the metal pipe 2 serves as a sample suction pipe and an internal electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980001644U JPH0120675Y2 (en) | 1980-01-10 | 1980-01-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980001644U JPH0120675Y2 (en) | 1980-01-10 | 1980-01-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56104504U JPS56104504U (en) | 1981-08-15 |
| JPH0120675Y2 true JPH0120675Y2 (en) | 1989-06-21 |
Family
ID=29598524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980001644U Expired JPH0120675Y2 (en) | 1980-01-10 | 1980-01-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0120675Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS551645A (en) * | 1978-06-20 | 1980-01-08 | Hitachi Maxell Ltd | Magnetic recording medium |
| JPS551827A (en) * | 1978-06-20 | 1980-01-09 | Mitsubishi Heavy Ind Ltd | Improved reverse osmosis treating method |
-
1980
- 1980-01-10 JP JP1980001644U patent/JPH0120675Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS551645A (en) * | 1978-06-20 | 1980-01-08 | Hitachi Maxell Ltd | Magnetic recording medium |
| JPS551827A (en) * | 1978-06-20 | 1980-01-09 | Mitsubishi Heavy Ind Ltd | Improved reverse osmosis treating method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56104504U (en) | 1981-08-15 |
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