For the purpose of this chapter, certain terms used herein are to have the following definitions:
"Cylinder guard"means a hardened ring surrounding the exposed portion of the lock cylinder or other device, which is so fastened as to protect the cylinder from wrenching, prying, cutting or pulling by attack tools.
"Deadbolt"means a bolt which has no automatic spring action and which is operated by a key cylinder, thumbturn or lever, and is positively held fast when in the projected position.
"Deadlocking latch"means a latch in which the latch bolt is positively held in the projected position by a guard bolt, plunger or auxiliary mechanism.
"Latch"means a device for automatically retaining the door in a closed position upon its closing.
"Light panel"means any glazed opening whether glazed with glass, plastic, metal, wood, or composition sheets or panels, or similar materials, and shall include windows, skylights, view ports or view panels, and similar openings.
(79-10)