Inspection periscope

Details Inspection periscope Inspection periscope

1982-03-19

1985-04-16

Corbin, John K.

350 961, G02B 2308

Patent

active

045112223

ABSTRACT:
An annular inspection lens is described for viewing obscured internal cylindrical surfaces. This annular lens provides a projected image of the internal cylindrical surface in all directions simultaneously and uses ambient light for illumination.

REFERENCES:
patent: 3073210 (1963-01-01), Packard
patent: 3283653 (1966-11-01), Tokarzewski
patent: 3413067 (1968-11-01), Froio

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