FR853355A
(en )
1940-03-18
Multiple phone system
FR856154A
(en )
1940-06-03
Advanced telephone system
FR853308A
(en )
1940-03-15
Multiple phone system
CH211740A
(en )
1940-10-15
Device for transmitting calls in carrier frequency systems.
FR1031552A
(en )
1953-06-24
Telephony system
CH210933A
(en )
1940-08-15
Antenna system for aircraft.
CH217893A
(en )
1941-11-15
Dual carrier frequency system.
DK58907C
(en )
1941-08-04
Device for multi-channel carrier frequency systems.
CH235396A
(en )
1944-11-30
Carrier frequency system.
CH233005A
(en )
1944-06-30
Switch for concentric high frequency lines.
CH206314A
(en )
1939-07-31
Carrier wave telephony system.
CH227467A
(en )
1943-06-15
Carrier frequency transmission system.
DK57879C
(en )
1940-08-12
Device for radios.
CH214051A
(en )
1941-03-31
Carrier frequency transmission system.
CH217894A
(en )
1941-11-15
Multiple carrier frequency system.
DK58643C
(en )
1941-05-05
Device for Carrying Frequency Systems for Call Transfer.
CH211741A
(en )
1940-10-15
Amplifier system in carrier frequency transmission systems.
DK62183C
(en )
1944-04-24
Dual carrier frequency system.
CH210928A
(en )
1940-08-15
Circuit device for carrier-frequency communication.
CH229097A
(en )
1943-09-30
Device for frequency modulation.
DK57790C
(en )
1940-07-15
Device at Insert for Radsaamaskiner.
DK56106C
(en )
1939-05-01
Device for telephone systems with two-part cables.
DK58675C
(en )
1941-05-12
Device for Advertising Apparatus.
DK59530C
(en )
1942-03-02
Drive device for Tone Carriers.
FR880646A
(en )
1943-03-31
Four-strand star cable for carrier frequencies