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en
AIzaSyCYaC8UkdPkQKLFUmpasLV5eC3M802CrcA
80425
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2

jan 1, 1974 - Begins racket experimentation; first using weights, then conceived spreading weight out (thus increasing area).

Added to timeline:

28 Sep 2017
0
0
115
Case Study 3

Date:

jan 1, 1974
Now
~ 44 years ago
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