CH65243A
(en )
1914-06-01
Telephone with device to amplify sounds
FR473933A
(en )
1915-02-02
Sound amplifier for sirens
FR479523A
(en )
1916-04-07
Improvements in the operation of shared lines in automatic telephony
FR16446E
(en )
1913-01-31
Device allowing automatic establishment of telephone communications
FR438092A
(en )
1912-05-07
Device allowing automatic establishment of telephone communications
FR467722A
(en )
1914-06-19
Device for tree protection
FR428045A
(en )
1911-08-21
Mechanism to automatically adjust the draft
FR457392A
(en )
1913-09-16
Telephone transmitter
FR593515A
(en )
1925-08-25
Device for amplifying the sounds of a phonograph
CH70979A
(en )
1915-11-16
Device to stop the ringing of telephone exchanges
FR469349A
(en )
1914-07-29
Microphone device for amplifying and recording radiotelegraph signals
DK29642C
(en )
1922-05-22
Microphone Signal Device.
CH64647A
(en )
1914-04-16
Window with device to catch insects
FR479510A
(en )
1916-04-07
Device for recording sounds
FR466485A
(en )
1914-05-14
Extendable acoustic arm, amplifier and sound purifier for phonographs
FR426374A
(en )
1911-07-05
Device to support the pants
FR461799A
(en )
1914-01-10
Cigar advertising device
FR19433E
(en )
1915-01-29
Devices for amplifying and recording radiotelegraph signals
FR470832A
(en )
1914-10-01
Devices for amplifying and recording radiotelegraph signals
FR429940A
(en )
1911-10-04
Device to prevent raised collars from yawning
FR442658A
(en )
1912-09-06
Device applicable to microphones
FR377396A
(en )
1907-09-05
Phonograph combined with string vibrator for sound amplification
FR401442A
(en )
1909-08-28
Sound amplifier telephone transmitter
FR17066E
(en )
1913-06-19
Telephone transmitter
CH67330A
(en )
1914-12-01
Telephone transmitter