CH349345A
(en )
1960-10-15
Semiconductor device for transmitting signals
FR1133943A
(en )
1957-04-03
Telegraph transmitter
CH335822A
(en )
1959-01-31
Gerät zur Reinigung der an Klosettschüsseln vorhandenen Hohlkehlen
FR1159382A
(en )
1958-06-26
Installation for the production of frequency modulated telegraph signals
CH332681A
(en )
1958-09-15
Single sideband receiver for voice signals
CH301274A
(en )
1954-08-31
Single sideband carrier frequency telephone system.
DK90577C
(en )
1961-03-13
Carrier telephony transmitter for transmitting single sideband voice signals.
FR1103962A
(en )
1955-11-15
Balanced frequency modulator
AT186687B
(en )
1956-09-10
Electroacoustic converter
CA490677A
(en )
1953-02-17
Frequency modulation receiver
DK92309C
(en )
1961-12-04
Single sideband receiver for voice signals.
AU201655B2
(en )
1955-04-21
Multiplex frequency modulation transmitter
CA499771A
(en )
1954-02-02
Voice frequency signaling system
CH345670A
(en )
1960-04-15
Carrier frequency communication system
AU380254A
(en )
1955-04-21
Multiplex frequency modulation transmitter
AT183788B
(en )
1955-11-10
Arrangement for the transmission of signals
CA503109A
(en )
1954-05-25
Amplitude modulation circuit
AU204866B2
(en )
1955-06-23
Multiplex frequency modulation receiver
CA495739A
(en )
1953-09-01
Electronic frequency modulator
FR1092133A
(en )
1955-04-19
Telephone bell
AT191472B
(en )
1957-08-26
Carrier frequency telephone system
CA499774A
(en )
1954-02-02
Voice frequency signaling circuit
FR1116210A
(en )
1956-05-04
Telegraph transmitter
CA503448A
(en )
1954-06-01
Voice frequency signalling systems
CA514584A
(en )
1955-07-12
Tone frequency signalling system