Hard Metals Canada Slide Rule
physical object
Identifier
2025.26.3
Description
This is a 5-inch plastic slide rule and case created by Hard Metals, Canadian Rock Company. This is a Mannheim-style slide rule, meaning that it has a scale featuring A, B, Ci, C, D, K, alongside S, L, T on the backside of the slide.
Related Term
slide rules (is described by)
