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Directory of FREE Online Books and FREE eBooks
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Browse Free Online Books and eBooks:
US Patent 2599112: Apparatus for determining the time of descent of instruments within boreholes
US Patent 2599442: Apparatus for stacking carton blanks
US Patent 2601779: Means for generating supersonic waves
US Patent 2602101: Variable angle ultrasonic transducer
US Patent 2602102: Variable angle ultrasonic transducer
US Patent 2602136: Modulating and transmitting apparatus
US Patent 2602137: High-frequency converter apparatus
US Patent 2602157: Ultrahigh-frequency variable impedance element
US Patent 2602161: Modulation system for craft guidance
US Patent 2602162: Radio beacon
US Patent 2602239: True rate of turn instruments
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