DK42173C
(en )
1930-05-05
Vibration device for Microphones, Speakers and similar Devices.
DK44019C
(en )
1931-04-20
Funnel for Headphones, Radio Speakers and the like.
DK41952C
(en )
1930-03-31
Electrodynamic Microphone, Speaker and the like.
DK35869C
(en )
1926-04-12
Earpiece for Telephones and similar Devices.
DK36965C
(en )
1926-12-27
Device for tensioning diaphragms for sound boxes, telephones, acoustic devices and the like.
DK43461C
(en )
1930-12-08
Device for Telephone Devices with Speaker and Highly Sensitive Microphone.
DK35312C
(en )
1925-11-23
Light funnel for Speakers, Gramophones and the like.
DK38857C
(en )
1928-06-11
Device for terminating telephone cables and the like.
DK38669C
(en )
1928-04-16
Telephone (Speaker), Microphone or similar Device.
DK44382C
(en )
1931-07-20
Electrodynamic Speaker.
DK43097C
(en )
1930-10-06
Device for electrical vibration devices, in particular for the recording and reproduction of sound.
ES106750A2
(en )
1928-06-16
Acoustic apparatus.
DK45886C
(en )
1932-07-04
Amplifier device for Telegraphy and Telephony.
AT116452B
(en )
1930-02-25
Sound signaling device.
DK38593C
(en )
1928-03-26
Sound Funnel or Speakers for Gramophones and Radios.
DK38775C
(en )
1928-05-21
Sound Reproducing Device (Speaker).
DK40925C
(en )
1929-10-14
Device for hanging cables and the like.
ES113687A1
(en )
1929-09-01
A vibrating organ for loudspeakers, microphones or similar devices.
DK42035C
(en )
1930-04-14
Acoustic Device.
DK44299C
(en )
1931-06-29
Acoustic Device.
CA285762A
(en )
1928-12-18
Sound amplifying device
DK40603C
(en )
1929-08-12
Device by Speakers.
ES103613A1
(en )
1927-08-16
An electrodynamic device.
DK46006C
(en )
1932-08-01
Sound absorbing device.
DK42292C
(en )
1930-05-26
Microphone.