NL21057C - - Google Patents

Info

Publication number: NL21057C
Authority: NL; Netherlands

Application number

Priority date (The priority date 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 date listed.)

1925-06-01

Publication of NL21057C publication Critical patent/NL21057C/xx

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones

Landscapes

Engineering & Computer Science (AREA)
Multimedia (AREA)
Physics & Mathematics (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)
Diaphragms For Electromechanical Transducers (AREA)
Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

NL21057D 1925-06-01 NL21057C (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US34255A US1630008A (en)	1925-06-01	1925-06-01	Cone-type loud speaker

Publications (1)

Publication Number	Publication Date
NL21057C true NL21057C (en)

Family

ID=21875256

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
NL21057D NL21057C (en)	1925-06-01

Country Status (6)

Country	Link
US (1)	US1630008A (en)
BE (1)	BE334366A (en)
DE (1)	DE551526C (en)
FR (1)	FR616148A (en)
GB (2)	GB252685A (en)
NL (1)	NL21057C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2810447A (en) *	1955-05-31	1957-10-22	Ford Motor Co	Rear seat speaker
US5418337A (en) *	1993-05-28	1995-05-23	Bose Corporation	Loudspeaker driver surrounding

0
- BE BE334366D patent/BE334366A/xx unknown
- NL NL21057D patent/NL21057C/xx active
1925
- 1925-06-01 US US34255A patent/US1630008A/en not_active Expired - Lifetime
1926
- 1926-04-13 GB GB9728/26A patent/GB252685A/en not_active Expired
- 1926-04-13 GB GB28790/26A patent/GB261426A/en not_active Expired
- 1926-05-14 FR FR616148D patent/FR616148A/en not_active Expired
- 1926-05-29 DE DEH106714D patent/DE551526C/en not_active Expired

Also Published As

Publication number	Publication date
BE334366A (en)
GB261426A (en)	1927-04-21
DE551526C (en)	1932-06-02
GB252685A (en)	1927-06-02
FR616148A (en)	1927-01-24
US1630008A (en)	1927-05-24

Publication	Publication Date	Title
AT108862B (en)	1928-02-10
AT107490B (en)	1927-10-10
FR628039A (en)	1927-09-17
BE331838A (en)	1926-02-27
AT108056B (en)	1927-11-25
AT99321B (en)	1925-02-25
AT108975B (en)	1928-02-25
AT108864B (en)	1928-02-10
AT108860B (en)	1928-02-10
FR593634A (en)	1925-08-28
FR29994E (en)	1925-12-11
FR612360A (en)	1926-10-22
FR595258A (en)	1925-09-30
FR590991A (en)	1925-06-26
BE331755A (en)
BE331749A (en)
BE331756A (en)
BE331844A (en)
BE331840A (en)
BE331823A (en)
NL18371C (en)
BE330822A (en)
NL21235C (en)
BE331348A (en)
BE331760A (en)