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Tyer's Electric Train Tablet system is a form of railway signalling for single line railways used in several countries; it was first devised in Great Britain by engineer Edward Tyer after the Thorpe rail accident of 1874, which left 21 people dead. [1]
A key punch room in the 1960s Hand-operated keypunch (manufactured by British ICT) (1960s) Most IBM keypunch and verifiers used a common electrical/mechanical design in their keyboards to encode the mechanical keystrokes. As a key was depressed, a link on the keystem tripped a corresponding set of bails at the top of the keyboard assembly.
Silca S.p.A. is a manufacturer of keys, key cutting machines, semi industrial and industrial key cutting machines. [1] Silca S.p.A. is a subsidiary of Kaba Group, a provider of selected segments of the security industry. Kaba Holding AG is listed on the SIX Swiss Stock Exchange and employs around 7,500 people in more than 60 countries. Silca ...
Each key tape would have been unique (a one-time tape), but generating and distributing such tapes presented considerable practical difficulties. In the 1920s four men in different countries invented rotor cipher machines to produce a key stream to act instead of a tape. [12] The 1940 Lorenz SZ40/42 was one of these. [13]
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Key cutting is the primary method of key duplication: a flat key is fitted into a vise in a machine, with a blank attached to a parallel vise, and the original key is moved along a guide, while the blank is moved against a blade, which cuts it.