USN Diving Helmet & Air Tank 1910 Blueprint Plans

$35

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Blueprint of a diving helmet & air tank system designed and constructed by Cypra Underwater Salvage Company of Worcester, Mass. in 1910. Plan shows a side elevation of the diving helmet and air tank, an enlarged vertical section through the diving helmet etc. There is also a numeral key to explain the various numbers on the plan….measures 14” x 19” and is produced on standard type blueprint paper.  I.D. #204

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