Description
Rare “Universale” slide rule pencil, cursor on clip. Conventional logarithmic scales. Marked DRPa Auslandspatente a, and USA Patent No.1599102 and Brit Pat. No. 259112.
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Fletcher
Fletcher Wallis
Fletcher Wallis sells objects and books relating to the history of science, medicine and technology Arcade. He publishes books through Vernier Press, including Antique Medicine Chests, and Corkscrew Patents from 1795. He has been dealing for forty eight years.