US PATENT SUBCLASS 52 / 2.17
.~ Including ingress/egress provision

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

2.11  DF  SHAPED OR STRENGTHENED BY FLUID PRESSURE {11}
2.17.~ Including ingress/egress provision

DEFINITION

Classification: 52/2.17

Including ingress/egress provision:

(under subclass 2.11) Structure wherein the enclosure includes a system, device, element, etc., which enables entry or exit, usually that of persons.

(1) Note. Included here is an air lock, a door, a flap, etc.