Radio signal controlled laser beam interrupting ditch slope indi

Details Radio signal controlled laser beam interrupting ditch slope indi Radio signal controlled laser beam interrupting ditch slope indi

1983-12-27

1986-04-22

Zarfas, Louis S.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 66, D12 6

Patent

active

D02834944

REFERENCES:
patent: D203873 (1966-02-01), Kielhorn
patent: D235527 (1975-06-01), Dransfield
patent: D236593 (1975-09-01), Katayama
patent: D259406 (1981-06-01), Jacobson
patent: 4490919 (1985-01-01), Feist et al.
Laser Instruments for Engineering Construction, from Spectra-Physics.

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