Automatic remote controlled opthalmic refracting chart projector

Details Automatic remote controlled opthalmic refracting chart projector Automatic remote controlled opthalmic refracting chart projector

1976-12-08

1978-05-30

Schaefer, Robert K.

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318467, G05B 1114

Patent

active

040925749

ABSTRACT:
An ophthalmic refracting chart projector having rotary slide discs, the images on which are projected on a screen, having remote operating controls permitting selective showing of the slides in selectable sequence.

REFERENCES:
patent: 2802978 (1957-08-01), Legros
patent: 3437895 (1969-04-01), Peters
patent: 3614578 (1971-10-01), Woodward et al.
patent: 3648139 (1972-03-01), Friedman
patent: 3655276 (1972-04-01), Wilkinson

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