Dating post slide rules Dating post slide rules

Dating post slide rules

Bozarth, forms Engineering Instruments, Inc.

Hemmi Slide Rules

Post-brand Hemmi-manufactured dules that have no podt code and are not marked Dating post slide rules in Occupied Japan almost surely barbie dating videos from to Cursor B is dating post slide rules glass, also patent Removal of the "N" prefix also indicated a variation in the model. He had two daughters, Rosanne Rosty and Roberta Rosty.

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Serial numbers started in beginning with 0 and going through then rolling over to 0 again. The absence of a patent number provides no information about the date of manufacture; slide rules intended for sale in Japan never carried US or British patent numbers--no matter when they were made.

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Rules with model numbers date from before this changeover, rules with model numbers 20 and above were made after the changeover. There was little if no logic to these numbers. Faber Date Of Manufacture Large 1. Serial numbers can be used to approximate the manufacture date of a given rule however not necessarily the sales date.

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Models dissapear; model numbers above 20 introduced. Wather's System Darmstadt slide rule introduced. Check out Dieter's book listed on my Slide Rule Books page to learn more about how to use these interesting features.

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It is not uncommon to find rules in the s in 68 xxxx series packaging but series model numbers on the rules. Thus, ' HF ' indicates a slide rule made in June The rule features basic scales, including S,L,T on the reverse of the dating post slide rules, along with inch and centimeter scales.

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In dating post slide rules, the Frederick Post brand name disappeared and the Teledyne Post '44' numbering system was introduced.

The cursor is also considerably larger, and it lacks the internal ruler under the slider. And, besides, we can violate our own rules if we want.

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Shows "Patented", Copyright and A very popular and sought after rule, I managed to snag this one in the original box with hard cover manual shown above. Cursor D is the "decimal-indicating" variant of C. Company renamed "Hemmi Keisanjaku Co.

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Post brand slide rules were usually relabeled standard products from well-known manufacturers, but about Hemmi began producing the model inch Versatrig and the inch Versalog specifically for Post.