Object Details maker Pickett & Eckel, Incorporated Description This aluminum ten-inch linear duplex slide rule is coated in Pickett's "Eye Saver" yellow plastic. The flat nylon indicator is screwed ...

Compare to MA.318481 The top edge of the rule is marked: PATS. PEND. MADE IN U.S.A. 4083-5 LOG LOG DUPLEX VECTOR ® COPYRIGHT 1947 BY KEUFFEL & ESSER CO. PATS. 2,500,460 2,168,056 2,170,144 2,285,722 2 ...