FR1107939A
(en )
1956-01-06
Telephone communication system
FR1108100A
(en )
1956-01-09
Telecommunication system
CH333375A
(en )
1958-10-15
Single sideband system for call transmission
CH330684A
(en )
1958-06-15
Communication facility
CH328282A
(en )
1958-02-28
Multiple reception system for high frequency waves
CH326748A
(en )
1957-12-31
Waveguide arrangement for traveling wave tubes
FR1116749A
(en )
1956-05-11
Teletype transmission facility
AT198318B
(en )
1958-06-25
Transmission system for carrier frequency telephony
AT191472B
(en )
1957-08-26
Carrier frequency telephone system
CH323186A
(en )
1957-07-15
Device for carrier frequency telegraphy
CH348427A
(en )
1960-08-31
Signal system for carrier flow communication system
AT186673B
(en )
1956-09-10
Carrier Frequency Telegraphy Facility
FR1092133A
(en )
1955-04-19
Telephone bell
CH345670A
(en )
1960-04-15
Carrier frequency communication system
AT180981B
(en )
1955-02-10
Telecommunication system
FR1109385A
(en )
1956-01-25
Carrier
CH320602A
(en )
1957-03-31
Microwave transmission line
FR1103962A
(en )
1955-11-15
Balanced frequency modulator
CH323185A
(en )
1957-07-15
Facility for carrier frequency telegraphy
CH313268A
(en )
1956-03-31
Playback system for high-frequency telephone broadcast
CH322498A
(en )
1957-06-15
Circuit arrangement for frequency-modulated waves
FR1116210A
(en )
1956-05-04
Telegraph transmitter
FR1114389A
(en )
1956-04-11
Frequency discriminator
CH319860A
(en )
1957-02-28
Frame construction for telecommunication systems
DK83514C
(en )
1957-09-23
Carrying frequency telegraph system.