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US3746927A
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Circuit for switching currents through inductive loads
|
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US3644888A
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Error-detecting apparatus for a keystroke-operated business machin
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US3707619A
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Actuating apparatus for a business machine
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US3648195A
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Modulator using a harmonic filter
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US3613101A
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Magnetic recording utilizing a selective magnetic shielding structure
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|
US3651311A
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Information signal generation apparatus
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Magnetic head with write gap wider than tape and read gap narrower than tape
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GB1224574A
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Improvements in or relating to recording systems for business machines
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US3561675A
|
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Recording system for business machines
|
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GB1270571A
|
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Improvements in or relating to frequency detectors
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CA925792A
|
|
Recording systems for business machines
|
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US3604606A
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Drive mechanism employing reaction forces
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US3617904A
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Noise insensitive peak detector
|
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US3612974A
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Digital motor speed control
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Error detection apparatus
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Acoustic coupler
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US3608808A
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Tape transport tensioning mechanism
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US3593005A
|
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Tape reader
|
|
GB1209557A
|
|
Improvements in or relating to apparatus for recording indicia on a recording medium and a magnetic transducer for use in such apparatus
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US3562765A
|
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Recording system for business machines
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