CH175420A
(en )
1935-02-28
Device for damping vibrations.
AT121484B
(en )
1931-02-25
Device for the transmission of sound vibrations.
CH122103A
(en )
1927-09-01
Device for transmitting vibrations.
CH213942A
(en )
1941-03-31
Electromechanical device for transmitting vibrations.
CH164583A
(en )
1933-10-15
Device for transforming electric oscillations into sound vibrations or vice versa.
FR716915A
(en )
1931-12-30
Electrodynamic device intended for the transformation of electrical oscillations into acoustic vibrations or vice versa
FR673502A
(en )
1930-01-16
Transmission system
AT121374B
(en )
1931-02-25
Device for the vibration-free mounting of speaking machine plates.
AT132150B
(en )
1933-03-10
Device for the photographic recording of acoustic vibrations.
AT108069B
(en )
1927-11-25
Device for the transmission or generation of sound waves.
CH132342A
(en )
1929-04-15
Device on drawing instruments.
AT108996B
(en )
1928-02-25
Acoustic device.
FR620035A
(en )
1927-04-13
Device for the production of acoustic vibrations
CH152937A
(en )
1932-02-29
Device for showing optical sound films.
FR591021A
(en )
1925-06-26
Self-regulating system for whistles
ES106750A2
(en )
1928-06-16
Acoustic apparatus.
AT121046B
(en )
1931-01-26
Device for self-ventilation of feed water and the like like
FR636821A
(en )
1928-04-17
Transmission device
FR662693A
(en )
1929-08-09
Musical vibration transformer
AT116452B
(en )
1930-02-25
Sound signaling device.
ES97213A1
(en )
1926-05-01
Acoustic instrument.
AT108127B
(en )
1927-11-25
Device for the production of saturated solutions.
FR700120A
(en )
1931-02-24
Device for transforming electrical oscillations into acoustic vibrations or vice versa
FR625837A
(en )
1927-08-20
Transmission system
AT102600B
(en )
1926-02-25
Device for draining damp walls.