US PATENT SUBCLASS 297 / 216.17
.~.~ Rectilinearly vertically

Current as of: June, 1999
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297 /   HD   CHAIRS AND SEATS

216.1  DF  CRASH SEAT {5}
216.16  DF  .~ Bottom and back movable as unit in response to force {3}
216.17.~.~ Rectilinearly vertically

DEFINITION

Classification: 297/216.17

Rectilinearly vertically:

(under subclass 216.16) Device wherein the bottom and back, in response to excessive force, move together in a line perpendicular to a substantially horizontal surface.