COLBY'S TOPOGRAPHICAL PROTRACTOR

COLBY'S TOPOGRAPHICAL PROTRACTOR Illustrated catalogue of engineering, surveying and scientific instruments manufactured by Mahn & Co. Publisher St. Louis, Mo. Woodward & Tiernan Printing Co. 1893

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TOPOGRAPHICAL PROTRACTOR catalogue catalog engineering surveying scientific science instruments instrument tool Mahn & Co. border mapping architectural civil engineer engineers architects architect architecture surveyors surveyor drafting draphting standard Mechanical technology technological technical history historic historical 19th century nineteenth century astronomical bubble level spirit levels measure measuring measurement measurements horizontal vertical angle angles telescope tripod psi idr

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