The scales on this 22-inch, two-sided wooden slide rule are printed on paper. The front has two scales on the left end of the base labeled B and C and two scales labeled A on the left end of the slide ...
This two-sided, ten-inch wooden slide rule is coated with yellowed plastic and has metal endpieces. A glass indicator is cracked on both sides and has metal and black plastic edges marked: DIETZGEN.
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