Brand:

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Model:

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Year:

(documented or estimated)

Background facts: 

Dynaspot

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GS 200

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1979

 

Movable mass tennis racket. Graphite Composition - String tension 53/58 lbs. 1982 US Pat No. 4.330.125 Dynaspot Corporation.

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The concept: The liquid in the racket frame puts the weight at the optimal point when hitting the ball