DK44005C
(en )
1931-04-13
System for Transmission of Signals with Device for Control of their Amplitudes.
FR621470A
(en )
1927-05-12
Telegraph transmission system
DK42110C
(en )
1930-04-22
Device for Secret Transmission of Signals.
DK42622C
(en )
1930-07-21
Device for Secret Transmission of Signals.
DK43169C
(en )
1930-10-13
Device for Secret Transmission of Signals.
DK35248C
(en )
1925-11-09
Automatic Operating Device for Transmitting Signals.
DK37108C
(en )
1927-02-07
Apparatus for the automatic transmission of telegraphic distress signals.
ES97873A1
(en )
1926-07-16
Maneuvering device for changes and signals.
DK37791C
(en )
1927-08-08
Device for setting and unloading shift tracks and signals.
DK44396C
(en )
1931-07-27
Device for Secret Transmission of Electrical Signals.
DK30161C
(en )
1922-09-04
Setting device for Signals and the like.
FR625837A
(en )
1927-08-20
Transmission system
FR636821A
(en )
1928-04-17
Transmission device
DK37437C
(en )
1927-05-09
Device for Receiving Wireless Signals.
ES96602A1
(en )
1926-04-01
A system of light signals.
FR31970E
(en )
1927-08-27
Remote selection system
FR597860A
(en )
1925-12-01
Receiver device of t. s. f.
ES90629A1
(en )
1924-12-01
A system of signals.
ES98485A1
(en )
1926-09-01
Television system.
GR1194B
(en )
1926-06-03
AUTOMATIC CHANGE SYSTEM.
DK33092C
(en )
1924-04-14
Device for Setting Warning Signals for Automobiles.
DK45735C
(en )
1932-05-30
Telegraphy Procedure for Automatic Creation of Received Signals and Apparatus for Execution of the Procedure.
ES99012A2
(en )
1926-11-01
An automatic switching system.
AT109607B
(en )
1928-05-10
Device for the clear control of automatic switching devices by means of slowly responding contact devices.
ES117747A1
(en )
1930-07-16
Submarine transmission of signals.