DK45070C
(en )
1932-01-04
Piezo-Electric Device for Receiving Modulated Electric Waves.
FR688455A
(en )
1930-08-23
Device for converting modulated high frequency electrical oscillations into acoustic oscillations
CH145543A
(en )
1931-02-28
Switching device.
ES115397A1
(en )
1930-01-01
MODULATION DEVICE.
DK46219C
(en )
1932-09-19
High frequency signaling device.
FR30070E
(en )
1926-01-26
Vibrating membrane for telephone devices
AT131405B
(en )
1933-01-25
Radio receiving device.
DK45661C
(en )
1932-05-09
Device for Receiving AC Signals.
DK39627C
(en )
1928-12-17
Device for Converting Electrical Oscillations to Mechanical Oscillations.
DK45835C
(en )
1932-06-20
Device by Telephone System.
ES113800A1
(en )
1929-08-16
Guard-post device.
GR2426B
(en )
1929-08-21
POLYGRAPHER DEVICE.
DK41848C
(en )
1930-03-17
Slide Generating Device.
DK47274C
(en )
1933-05-01
Coupling device for Telephone system.
DK37285C
(en )
1927-03-28
Baandmaal til Maaling af Svin.
DK46602C
(en )
1932-12-05
Device for Telephone Systems for the Transmission of Selection Pulses over Duplicate Wires.
DK41755C
(en )
1930-03-03
Device for Converting Electrical Oscillations to Mechanical.
DK41455C
(en )
1930-01-13
Device by Telephone Systems.
DK43009C
(en )
1930-09-22
Device by Telephone Systems.
ES112652A1
(en )
1929-07-01
Electrical device for remote signals.
DK44173C
(en )
1931-06-01
Calorifier device.
DK44081C
(en )
1931-05-04
Charging device for electric igniters.
DK35834C
(en )
1926-04-06
Device for Fastening Electrical Switches.
DK42522C
(en )
1930-07-07
Device at Hesteriver.
DK42066C
(en )
1930-04-14
Device at Laase.