| E: | SECTION E FIXED CONSTRUCTIONS |
| E06: | DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS, IN GENERAL; LADDERS |
| E06B: | FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES, OR LIKE ENCLOSURES, IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES |
| E06B5/00: | Doors, windows, or like closures for special purposes; Border constructions therefor |
| E06B5/10: | . for protection against air-raid or other war-like action; for other protective purposes |
| E06B5/12: | . . against air pressure, explosion, or gas |
| E06B5/14: | . . . Gasproof doors or similar closures; Adaptation of fixed constructions therefor |
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