Light beam clock

Details Light beam clock Light beam clock

1981-09-21

1984-06-12

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Clock or clock case

Case having geometric configuration in front elevation

Patent

active

D02742250

REFERENCES:
patent: D105293 (1937-07-01), Mariani
patent: D110124 (1938-06-01), Schlenker
patent: D249648 (1978-09-01), Geitenbeek
patent: 1711296 (1929-04-01), Willens
patent: 2642713 (1953-06-01), Prins
patent: 2749704 (1956-06-01), Heikkila
patent: 3668858 (1972-06-01), Hartwig
patent: 4036009 (1977-07-01), Sampson

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