B61-66
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Item no.: 166449312875
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B61-66 CALIPERS. Bjornstad Patent. Patented in 1917 by Alfred Bjornstad of Ft. Leavenworth, KS, and designed specifically to read the slope on topographical relief maps. 14" long, clearly marked and, for inclinometer enthusiasts, includes a small hanging pointer to measure the slope between two points. From the collection of Don Rosebrook. Fine 100-200
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