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Aconic collector
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Filter darkroom light
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Laser goggles
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Solar cell with wrap-around electrodes
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Electromechanical devices using ionic semiconductors
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Vibration testing system with impedance compensation
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Moving coil electrodynamic exciter with cooling means
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Multi-degree-of-freedom force transmitting structure
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Apparatus for monitoring the intensity of a beam of radiant energy
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Optical collimating system
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Character reading system employing sequential sensing of matrix input
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Vibration testing apparatus
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Vibration pickup
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Improvements in or relating to vibration exciter apparatus
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