Sundial

Details Sundial Sundial

1978-06-06

1980-09-23

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Time-measuring instrument or casing

Sundial

D1003

Patent

active

D02570068

REFERENCES:
patent: D40663 (1910-04-01), Pease
patent: D209223 (1967-11-01), Vuilleumier
patent: 2754593 (1956-07-01), Sunblad
Mayalls "Sundials"-.COPYRGT.1938, p. 22, Heliochronometer.
Sundials & More, p. 4, Sundial at bottom.

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