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AU2300783A
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Door operator
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US4520684A
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Tape drive closure operator
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US4414778A
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Tape drive door operator
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US4307271A
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Switch mechanism
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US4352585A
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Door operator screw coupling
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US4319102A
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Multi-pole switch
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US4334161A
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Centrifugal switch and motor control
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US4357564A
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Closure operator control
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US4103238A
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Transmitter modulated with three modulation patterns
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US4064487A
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Receiver and decoder
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US4119896A
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Sequencing control circuit
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US4048630A
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Door operator with automatic control of auxiliary circuit
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US4041259A
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Switch mechanism
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US4070555A
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Switching mechanism
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US3959756A
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Electrical switching device
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US3898582A
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Transmitter encoder with output for a time period
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US3851125A
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Door operator control
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US3768018A
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Transmitter-receiver alignment system and method
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US4013910A
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Electric motor, stator and lamination therefor
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US3719005A
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Door operator reversing control
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