Object Details maker SUN HEMMI JAPAN CF Description This bamboo rule is coated on both sides and its long outer edges with white celluloid. The rule is held together with metal posts. The glass ...

The firm moved from Chicago to Skokie in 1960. As early as 1965, Welch advertised this projection slide rule as number 0253 in its catalog, selling it for $7.50. In 1968, Welch merged with E. H.

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