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Plessey Code is a one-dimensional linear barcode symbology system based on pulse width modulation. It was developed by the British Plessey Company plc in 1971 and was officially used in May 1971. It is mainly used in library management. J.Sainsbury's first used the system in the early 1970s to identify all products on supermarket shelves for its product replenishment system.

The main advantages are that it is relatively easy to print on the dot matrix printers that were popular when this code was introduced, and that it is slightly denser than the more common 2 of 5 and 3 of 9 codes.

It was one of the earliest barcode symbologies and is now still rarely used in shelf labels in some libraries and retail stores, partly as a solution to internal requirements for inventory control.

It is a barcode symbol represented by numbers 0-9, with a start character and an end character.

It uses a special encoding method in which each character consists of four bars and four spaces.

Its check digit is obtained by summing the odd digits of all characters, multiplying by 2, adding the even digits of all characters, and finally taking the single digit.

It is a barcode symbol represented by numbers 0-9, with a start character and an end character. Plessey Corporation is an electronics, defense and telecommunications company founded in 1917 and later spun off and acquired. It was also the first company to design an industrial-grade secure computer. Now, Plessey Company is mainly engaged in the research and development of micro-LED display technology.

It later had several variants called Anker Code (also known as Plessey modifications) led by ADS Corporation, Telxon, and MSI.


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