CH83048A
(en )
1920-04-01
Device for cleaning and disinfecting telephone sets
FR519035A
(en )
1921-06-03
Microphone
CH80919A
(en )
1919-04-16
Device for holding sheaves
CH81699A
(en )
1919-11-17
Device for the horns of telephone sets to prevent infections
DK29050C
(en )
1921-12-19
Holding device for Telephones, Hearing Tubes and the like.
CH80297A
(en )
1919-02-17
Disinfection device
CH83395A
(en )
1919-12-01
Device for massaging
AT96076B
(en )
1924-02-25
Device for the electrical transmission of acoustic processes.
CH81899A
(en )
1919-12-16
Extraction process and facility for carrying out the process
DK29606C
(en )
1922-05-22
Electrode for electrolytic and other purposes.
DK30672C
(en )
1922-11-13
Procedure and device for avoiding the twisting of flexible shafts.
DK26572C
(en )
1920-09-06
Microphone.
DK26801C
(en )
1920-10-25
Procedure for Increasing the Bleaching and Purifying Effect of Bleaching Soils.
CH77677A
(en )
1918-05-16
Jaw chucks
DK27616C
(en )
1921-05-17
Sound suit for voice machines and the like.
DK29167C
(en )
1922-01-16
Listening microphone.
CH80898A
(en )
1919-04-16
Device against contamination during telephone conversations
CH81281A
(en )
1919-05-16
Device for stamping artificial stones
ES67157A1
(en )
1918-07-01
Improvements in the connection of telephone devices.
CH79080A
(en )
1918-10-01
Annealing and hardening apparatus
DK24960C
(en )
1919-09-08
Device for Kumteseler and the like.
DK28829C
(en )
1921-11-21
Electric Hearing Aid for the Deaf.
DK27021C
(en )
1920-12-20
Perforated device.
CA186865A
(en )
1918-10-08
Sterilizing device
DK23912C
(en )
1918-12-23
Device for holding axles and the like.