Two relatively-adjustable aperture-defining members moving as a unit

Full Title

Exposure-making shutters; Diaphragms > Shutters > Blade or disc rotating or pivoting about axis normal to its plane > Two relatively-adjustable aperture-defining members moving as a unit

Classification Context

Section:

PHYSICS

Class:

PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY

Subclass:

APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR