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![]() "Patent" Engraved on Left of Slider |
This mystery rule does not have either the model number
or the manufacturer's name on it. I am assuming it is a Hemmi, based on
the fact that there is a "PATENT.No.22129" inscribed in the well, and
that characters such as π closely resemble those of Hemmi rules. What are the model number and approximate year of manufacture? They are very interesting questions. I will certainly try to come up with the answer. In the meanwhile, I challenge you to solve this mystery as well. This mystery rule was given to me by Zvi Doron. I would like to express my thanks for his generosity. |