Trapezoidal smooth grooves for video disc

Details Trapezoidal smooth grooves for video disc Trapezoidal smooth grooves for video disc

G - Physics

11

B

181/26, 352/89,

G11B 9/00 (2006.01) B29D 17/00 (2006.01) G11B 3/70 (2006.01) G11B 3/72 (2006.01) G11B 11/12 (2006.01)

Patent

CA 1009960

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