Circular navigational rule aid

Details Circular navigational rule aid Circular navigational rule aid

1981-09-11

1983-11-15

Zarfas, Louis S.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D18 10, D1004

Patent

active

D02713829

REFERENCES:
patent: D135282 (1943-03-01), Green
patent: 1145020 (1915-07-01), Hill
patent: 3747845 (1973-07-01), Portuesi
patent: 3855706 (1974-12-01), Price

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