Notes: "The K&E model 4095 Merchant Slide Rule was introduced in 1915 and made until approximately 1943, when it disappeared from the K&E catalog. The 4095 was designed for multiplication and division. K&E targeted this slide rule at merchants, importers, exporters, accountants, managers, mechanics, foremen, etc. When introduced in 1915 the model 4095 had the new “frameless” cursor, which consists of the front and rear glasses screwed directly to the top and bottom blocks, with no frame around the glass. In 1915 K&E used metal blocks, but from 1916 on used celluloid blocks. This slide rule has the metal blocks, and is therefore from 1915, the first year of production for the 4095. "
