Collimator-gyroscope for Obtaining Artificial Horizons Patent Print - Chalkboard

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Collimator-gyroscope for Obtaining Artificial Horizons Patent Print - Chalkboard Patent Title: Collimator-gyroscope For Obtaining Artificial Horizons Inventor Name: Prosper Ponthus; Leon Therrode Year Issued: July 29 1902 Item Number: 13619...

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