|
US2864897A
(en)
|
|
Universal phonograph pickup head or the like
|
|
US2852604A
(en)
|
|
Sound reproduction apparatus
|
|
BE406882A
(enrdf_load_stackoverflow)
|
|
|
|
US1827051A
(en)
|
|
Recording and reproducing system and apparatus
|
|
US1952809A
(en)
|
|
Sound reproducing apparatus
|
|
US1728278A
(en)
|
|
Electromagnetic translating device
|
|
US1915804A
(en)
|
|
Electrodynamic pickup
|
|
US2547464A
(en)
|
|
Sound recording and reproducing apparatus
|
|
Dimmick et al.
|
|
Extension of the frequency range of film recording and reproduction |
|
US3281706A
(en)
|
|
Automatic gain control device for high fidelity audio systems
|
|
US1531252A
(en)
|
|
Electrical reproducer for phonograph records
|
|
CH462251A
(fr)
|
|
Dispositif détecteur à seuil des vibrations d'un haut-parleur
|
|
US1580954A
(en)
|
|
Electromagnetic sound reproducer
|
|
BE358204A
(enrdf_load_stackoverflow)
|
|
|
|
US2333517A
(en)
|
|
Light valve
|
|
US1759967A
(en)
|
|
Electric sound transmitter
|
|
Collins et al.
|
|
In/Out: Speaker as Microphone, Microphone as Speaker, the Symmetry of It All |
|
US1557529A
(en)
|
|
Electrical reproducer for phonographs
|
|
JP2008131055A
(ja)
|
|
スピーカ、オーディオ装置
|
|
US2042237A
(en)
|
|
Travel sound source
|
|
US1771323A
(en)
|
|
Attachment for electric amplifiers
|
|
Kellogg
|
|
The three-electrode vacuum tube as applied to the talking motion picture |
|
US1329928A
(en)
|
|
Sound-magnifying phonograph
|
|
EP0223652A1
(fr)
|
|
Convertisseur pour lecteur de compact-disques
|
|
Hoxie
|
|
The pallophotophone |