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All these firms produced slide rules under their name as well as their primary business of drafting supplies: 1867 Keuffel & Esser, form an engineering supply house 1878 Eugene Dietzgen immigrates from Germany and settles in New York where he goes to work for Keuffel & Esser, now 11 years in business in the US. 1880 The Bruning family arrives from Nyborg, Denmark and settles in Cincinnati. 1885 Eugene Dietzgen starts a business in Chicago that later becomes the Eugene Dietzgen Co. Charles Bruning, his brother Jacob, and cousin Frederick Post arrive in Chicago. The use of the "N" prefix is not always consistent.

Fred Post goes to work at Eugene Dietzgen's company. Removal of the "N" prefix also indicated a variation in the model.

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Post itself actually made no slide rules; even those rules that bore the Post brand name were manufactured by others.

At one time or another Post brand slide rules were made by Dennert & Pape, Nestler, Faber, Hemmi, Lawrence Engineering Service, Charvoz-Roos, Bruning and Gilson.

Having contact with the original owner of a slide rule that remembers the year it was purchased helps on determining the age. In general it is safe to assume a linear production rate between the rollover dates particularly for the common types rules.

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There are numerous examples of 68 xxxx series numbers on retail boxes and the slide rule inside has the old 4000 series number on it.

Catalogs are an excellent indication of when a model was produced or discontinued. This chart was developed by Ed Chamberlain to help determine the date of manufacture, but one must first zero in on which period the slide rule was made.

Sometimes the copyright date in a manual is used to determine the approximate age, but one printing could span several decades. Look at catalog's in the museum library and visit Clark Mc Coy's: Serial numbers started in 1924 beginning with 0 and going through 999999 then rolling over to 0 again.

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