International Workshop AW

Mike's second unknown rule.

Proportions/type-setting

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Proportion rule

Data:

  • 18-inch proportions/type-setting rule.
  • Scales: A = B P L C = P
  • Have seen only one other for sale.
  • Somewhat similar in construction to American Blueprint Military rule.

Questions:

  1. Who was the maker?
  2. What year? (perhaps 1940/50s)