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"A few years ago, my mother gave me some reel-to-reel tapes that her and my father exchanged back in 1967 while he was serving in Viet Nam as an officer in the Marine Corps. He died in 1972 when I was 8 years old. Neither my mother or I have a RtoR player so we weren't sure if the 30+ year old tapes were salvagable. I sent them into you and I ..."

Groove shape

The geometric form of the cross-section of a groove. It is defined in terms of the radius of the bottom of the groove (bottom radius) and the included angle between the walls of the groove (groove angle).