|
US3825700A
|
|
Articulated hearing aid temple and behind-the-ear hearing aid element
|
|
US3809829A
|
|
Acoustic cros hearing aid
|
|
US3813499A
|
|
Hearing aid nozzle with resilient bayonet lock
|
|
US3637969A
|
|
Fluid metal electrical switch
|
|
US3673002A
|
|
Carrier for variable battery retention
|
|
US3578921A
|
|
Miniature multiple-diaphragm acoustic mechanoelectric transducer device
|
|
US3527900A
|
|
Stereophonic phonograph pickups having a pair of vertically oriented bendertype beam transducers and force changing coupler
|
|
US3538232A
|
|
Musical instrument and piezoelectric pickup with diaphragms and inertial mass
|
|
US3622397A
|
|
Fast rechargeable sealed nickel-cadmium battery cells combined with excess pressure and temperature controls
|
|
US3531601A
|
|
Phonograph pickup cartridge with selectively settable compliance
|
|
US3470025A
|
|
Third-electrode rechargeable alkaline battery cells and associated battery circuits
|
|
US3415690A
|
|
Normally sealed vented metal encased rechargeable cell with excess pressure vent release
|
|
US3451857A
|
|
Liquid level indicators and particularly level indicators for indicating the electrolyte level in vented rechargeable batteries
|
|
US3502822A
|
|
Electromagnetic transducer having means to optimally position an acoustic reed
|
|
US3491215A
|
|
Acoustic electromagnetic transducer device having means for protecting coil-wire insulation
|
|
US3475565A
|
|
Resonant-peak motion of beam-shaped mechanoelectric audio-frequency transducers damped by limited fluorocarbon polymer volume
|
|
US3515821A
|
|
Multipurpose transducer housing plug with acoustical vent
|
|
US3410464A
|
|
Phonograph record player cartridge with groove cleaning attachment
|
|
US3491203A
|
|
Temperature stabilized amplifier
|
|
GB1100080A
|
|
Battery structure
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