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High-Speed Digital Tachometer Disclosure Number: IPCOM000066546D
Original Publication Date: 1979-Mar-01
Included in the Prior Art Database: 2005-Feb-20

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Brown, DH [+details]


The figure illustrates a device for determining the speed of a rotating member during each revolution. Such a mechanism is required during the servo writing of magnetic disk files to assure that the servo writing head is flying at the specified height.