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Adix is a relatively simple column adder for adding numbers up...
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This is a double-sided circular slide rule calculator consisting...
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This is a rare Albert Nestler early Mannheim slide rule no.9 with...
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An Albert Nestler Rietz slide rule no. 20/1 with mahogany body,...
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This 10 inch slide rule is almost new in its original box including...
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A Japanese Abacus, with 5 beads in 15 rows. Abacus comes from the...
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Otis King Slide Rule Calculator Model 'K'. This is a cylindrical...
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This is a double sided rule made of German silver and glass by...
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Consett Iron Co Ltd Weight Calculator for Steelwork. Double sided...