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All Patents in class 340/686.3
Patents 1 - 2 of 2
First set of recordsLast set of records
NumberDatePatenteeTitleType
2,685,082Jul. 27, 1954W.D. Caldwell, W.W. BemanPosition Indicating Devicespecial purpose gauges
2,788,519Apr. 09, 1957W.D. CaldwellPosition Indicating Devicemeasurement gauges
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