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Lapping is a machining process in which two surfaces are rubbed together with an abrasive between them, by hand movement or using a machine. Lapping often follows other subtractive processes with more aggressive material removal as a first step, such as milling and/or grinding .
Thomas Crapper was born in Thorne, West Riding of Yorkshire, in 1836; the exact date is unknown, but he was baptised on 28 September 1836.His father, Charles, was a sailor.
Pocket knives, hand tools, railway locks, and advertising items from Keen Kutter are of interest to many collectors. Jerry and Elaine Heuring, authors of Collector's Guide To Keen Kutter , have documented current values and general information in their books.
Although an antique tool might be said to be one that is more than a hundred years old, the term is often used to describe any old tool of quality that might be deemed collectable. The use of tools is one of the primary means by which humans are distinguished from other animals.
A Mullard TDD4 valve. The gold spray coating served no purpose other than to hide the blackened interior, as Mullard valves were still manufactured using the azide process, long abandoned by other makers. [1] A Mullard EL34 power pentode An EL84 valve made in Russia in the 21st century. Mullard Limited was a British manufacturer of electronic ...
The company was founded by William Elvis Sloan in Chicago, Illinois in 1906 with the introduction of the Royal flushometer, a valve to release a measured amount of water to flush a urinal or toilet. Initial sales were very poor: only a single Royal model flushometer was sold in 1906, and two in 1907.