AT96062B
(en )
1924-02-25
Device for the transmission of telephone and telegraphic signals by means of high frequency waves.
FR517422A
(en )
1921-05-06
Advanced telephone transmitter
ES74292A1
(en )
1920-10-01
An improved procedure and its corresponding apparatus, to eliminate the disturbing vibrations of determined frequencies.
AT96076B
(en )
1924-02-25
Device for the electrical transmission of acoustic processes.
AT96072B
(en )
1924-02-25
Device for modulating high frequency signal waves.
AT96060B
(en )
1924-02-25
Device for wireless transmission of telephone and telegraph signals.
AU1656520A
(en )
1920-07-12
Transmitting arrangements for pigh frequency telegraphy and telephony
CA225788A
(en )
1922-11-07
Signal transmission control by high frequency waves
FR615741A
(en )
1927-01-14
Pavilion for acoustic headphones of phonographs, telegraphs, telephones, radio telegraphs and radio telephones, etc.
ES72354A1
(en )
1920-04-09
Signals on radio telegraph devices.
DK35683C
(en )
1926-02-22
Duplex System for Signaling with High Frequency Waves.
DK33125C
(en )
1924-04-22
Transmission system for High Frequency Telegraphy and the like.
ES72475A1
(en )
1920-04-28
Improvements in the reception methods of telegraphic and radiotelephone signals.
AT109078B
(en )
1928-03-10
System for transmission by means of carrier waves.
ES69916A1
(en )
1919-07-01
Methods and apparatus for radio telegraphic signals.
DK34490C
(en )
1925-05-11
Apparatus for Sending and Receiving Sound Waves.
AU1115219B
(en )
1920-06-01
An improved antiseptic eap fop the mouthpieces of telephones
FR517955A
(en )
1921-05-18
Underwater sound receiver
AT99334B
(en )
1925-02-25
Device for rhythmically influencing electrical waves.
DK33502C
(en )
1924-08-04
Telephony device with high frequency oscillations.
FR509003A
(en )
1920-10-29
Telephone transmitter
DK27121C
(en )
1921-01-24
Sound Collector for Sound Transmitting Devices.
ES81391A1
(en )
1922-10-16
Low frequency electrical signal reception apparatus.
ES72427A1
(en )
1920-04-28
Arrangement for the transmission of wireless telegraphy signals from submarines.
ES78693A1
(en )
1921-09-16
An improved procedure, and its corresponding apparatus, for the reception of signals by wireless telegraphy.