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Materials used to manufacture perforated metal sheets include stainless steel, cold rolled steel, galvanized steel, brass, aluminum, tinplate, copper, Monel, Inconel, titanium, plastic, and more. [1] The process of perforating metal sheets has been practiced for over 150 years.
Demonstration of two perforated sheets at Bletchley Park Museum. The Cipher Bureau's manual manufacture of the sheets, which for security reasons was done by the mathematician-cryptologists themselves, [4] using razor blades, was very time-consuming. By 15 December 1938 only a third of the job had been finished.
The Detasheet trademark is now owned by the Ensign-Bickford Aerospace and Defense Company, which has been selling an identical explosive sheet product called Primasheet [1] since 1984. Primasheet-1000 and Detasheet are identical and when purchased the packaging contains both trademarks.
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