Optical refraction testing instrument

Details Optical refraction testing instrument Optical refraction testing instrument

1975-04-04

1977-05-24

Ansher, Bernard

Medical and laboratory equipment

Equipment for diagnosis, analysis, or treatment

Orthopedic or chiropractic

D2401

Patent

active

D02444836

REFERENCES:
patent: D207675 (1967-05-01), Hermann
patent: D212647 (1968-11-01), Minas
patent: D213918 (1969-04-01), Cohen
patent: 2283769 (1942-05-01), Schwanzel
patent: 3778164 (1973-12-01), Walker

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