Recent estate sale buy. Stanley folding box rule calipers. Nos 32, 36 and 136. 12 inch, 6 inch and 3 inch. The 3 inch has lost it's marking, but the impressions are still visible. I rarely see anything like this. There were longer rules, but they were warped. The husband or wife collected slide rules and pre electronic calculators. There were dozens large and small.
