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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.
Seemingly Coalport was named Coalport because of the coal that was transferred from canal boats to river vessels in the Coalbrook Dale area. Very early Coalport porcelain was unmarked, (c1805 and before) and in reality marks were rarely used before 1820.The shroud is kept in the royal chapel of the Cathedral of Saint John the Baptist in Turin, northern Italy.