|
US2807674A
|
|
Stereophonic sound system and method
|
|
US2783677A
|
|
Stereophonic sound system and method
|
|
US2807675A
|
|
Stereophonic sound method and apparatus
|
|
US2797263A
|
|
System and method for recording and reproducing records
|
|
US2769036A
|
|
Multiple head for magnetic recording and reproduction
|
|
US2563882A
|
|
Magnetic recording system
|
|
US2563850A
|
|
Magnetic tape recorder
|
|
US2680386A
|
|
Filtered motor drive
|
|
US2683568A
|
|
Message selector for magnetic reproducers
|
|
US2639867A
|
|
Tape reel mounting
|
|
US2622813A
|
|
Aligning mechanism for tape recorders
|
|
US2551845A
|
|
Recording head assembly
|
|
US2634335A
|
|
Magnetic recording system with negative feedback system
|
