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The KL-51 is an off-line keyboard encryption system that read and punched paper tape for use with teleprinters. In NATO it was called RACE (Rapid Automatic Cryptographic Equipment). It was developed in the 1970s by a Norwegian company, Standard Telefon og Kabelfabrik (STK). It used digital electronics for encryption instead of rotors, and it ...
The Wheatstone slip was a paper tape that contained holes in a pattern to control the mark and space signals on the telegraph line. The paper tape was from 0.46 to 0.48 inches in width, (but the standard width is from 0.472 to 0.475 inches) and a standard thickness of 0.004 to 0.0045 inches. [3] Olive oil coating lubricated the punch process. [4]
AutoNumber is a type of data used in Microsoft Access tables to generate an automatically incremented numeric counter. It may be used to create an identity column which uniquely identifies each record of a table.
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The printing paper is an 8.44 inch by 4.5 inch diameter roll. Ribbons are 0.5 inch wide by 60 yards long with plastic spools and eyelets for proper ribbon reverse operation. Model 28 Automatic Send-Receive Set. The Teletype Model 28 ASR, introduced in 1957, [11] was designed and built using existing stand-alone components and packaged as a ...
Instead of directly transmitting to the line, the keypresses of the operator punched holes in the tape. Each row of holes across the tape had five possible positions to punch, corresponding to the five bits of the Murray code. The tape was then run through a tape reader which generated the code and sent it down the telegraph line.
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The label (e.g. 0/P,R) near the outgoing state (at the "tail" of the arrow) specifies the scanned symbol that causes a particular transition (e.g. 0) followed by a slash /, followed by the subsequent "behaviors" of the machine, e.g. "P print" then move tape "R right". No general accepted format exists.