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A batch code is printed or stamped on the bottom of a product packaging.Dating a slide rule becomes difficult if a manufacturer did not imprinting a date code or serial number on the stock. This comprehensive research will enable you to find the period of manufacture for most every Dietzgen slide rule from 1887 through 1972.Even then, some manufacturers recycled their serial numbers over time, and the stock could have been left on a shelf for a period of time before the slide rule was assembled and shipped. Combined Large 6.47MB Most Keufel & Esser slide rules had serial numbers, but unfortunately they reused their 6-digit serial numbers several times.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.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.Post also sold branded slide rules from Richardson, Vicari, Boucher, Sexton, Halden, Chandler, Ritow and Winslow.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.Dates that a design was registered or patented only suggests an approximate year a model may have been first produced, as the model may have been distributed a year or more before issuance (patent pending). There were three rollovers occurring in 1943-1944, 1954, and 1962.

Select a brand to see instructions on how to look like for batch codes of the brand.

A batch code is usually stamped or printed with a dot-matrix printer.

You can be confused with the catalog number of the product (Ref.) and EAN / UPC number (barcode), which also appear on the packaging, but these numbers are printed in a standard way.

It’s been said that Mars was likely once covered in a massive ocean, spanning almost half of the red planet’s northern hemisphere – now, UFO hunter claims he’s found proof. This also explains the three different boats we have found last year.‘I do feel Nasa went overboard with their 2 billion dollar fishing equipment to catch this one, but its defiantly worth mounting on the wall. Lets see how Nasa gets off the hook with this one, shall we?

Among the rocks on the Martian surface, the alien enthusiast has spotted what he says is a large petrified fish‘I colored the fish to make it easier on the eyes.

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