Let-ball detectors

Details Let-ball detectors Let-ball detectors

1977-03-14

1978-03-28

Caldwell, Sr., John W.

Communications: electrical

Systems

Game reporting

73658, 273 29R, G08B 2300, A63B 6100

Patent

active

040817989

ABSTRACT:
Electric currents induced by a magnetic field being moved in relation to a fixed coil, by a vertical displacement of the net cable/tennis net, enables a referee to detect the occurrence of a "let-ball."

REFERENCES:
patent: 3415517 (1968-12-01), Krist
patent: 3677077 (1972-07-01), Merryman et al.
patent: 3697867 (1972-10-01), Klessattel
patent: 3774194 (1973-11-01), Jokay et al.
patent: 3924261 (1975-12-01), Kardashian
patent: 3982759 (1976-09-01), Grant
patent: 4004805 (1977-01-01), Chen et al.

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