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Coin material testing device
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Temperature controller
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Coin examination apparatus employing an rl relaxation oscillator
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Coin acceptor apparatus
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Coin selecting device
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Self tuning low frequency phase shift coin examination method and apparatus
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Photographic flash lighting and synchronizing system
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System for discriminating classification of a magnetic recording medium
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Intermediate frequency transformer
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Means for testing electronic circuit components
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Capacity actuated burglar alarm
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Coin prover and sorter
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Electronic switches
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Time delay relay circuit
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Testing apparatus
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Coin controlled switch
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Remote control
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Coin testing
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Foul detecting and signalling mechanism
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Tuning mechanism for radio apparatus
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