Hamann Manus R manual calculating machine with automatic division, serial no. 42478, with dust cover, by DeTeWe Communications GmbH, Berlin, Germany, 1953-1955 Hamann Manus R manual calculating machine with automatic division
Rolling rule with 30cm scale and protractor made by Shinomo, plastic, overprinted Club Panoly Resort Hotel, Boracay, Philippines Rolling rule with 30cm scale and protractor made by Shinomo
Klugh's Ellipsograph by E.A. Neham, marked 'C&G M462 - Imp. College ' in box Klugh's Ellipsograph by E.A. Neham
Semicircular single-arm protractor in case: by J.M. Kleman and Son, Amsterdam, early 18tyh century. Diameter 6 11/ 16" divided to 1/2 degrees, reads by vernier to 1 minute of arc Semicircular single-arm protractor in case: by J.M. Kleman and Son
Slide rule with single slider and cursor for traffic flow calculations by Nestler for Westfalisches Versandhaus, Bielefeld, Germany, in cardboard case with typewritten French instruction sheet Slide rule with single slider and cursor for traffic flow calculations by Nestler for Westfalisches Versandhaus
Selection of three Dutch slide rules, plastic, for artillery use. Selection of three Dutch slide rules