Golf club point of impact and relative club velocity indicator

作者: Eduardo Cervantes , Steven R. Puschmann

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摘要: A golf club point of impact and relative velocity indicator for recording the location at which head a impacts ball includes: a. heat sensitive chemical top coating providing permanent black image if is applied thereto, said including layer direct thermal face stock, b. fibrous paper having first second sides, side being secured with c. an adhesive backing to paper, adapted removable attachment striking club.

参考文章(5)
Michael D. Jones, Golf club ball-impact marker ,(1990)
F Manheck, Golf club impact marker ,(1972)
Norman Bradburn Hope, Golf club strike indicator ,(1994)
Eugene F Grossman, Indicating disk for golf club heads ,(1950)