General

A stand of tiered planks providing undivided space for seating.

A steel door which has been fabricated to resist dynamic stresses caused by blast pressures up to 3,000 lb per

A heavy, flexible covering (usually made of woven-wire rope or cordage); covers an area during blasting, to prevent rock or

A metallic tube closed at one end, containing a charge of one or more detonating compounds, and designed for and

Using explosives to loosen rock or other closely packed materials.

A drill which cuts holes in rock for the placement of explosives.