US PATENT SUBCLASS 405 / 288
.~.~ Roof support

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

258  DF  EARTH TREATMENT OR CONTROL {5}
272  DF  .~ Shoring, bracing, or cave-in prevention {6}
288.~.~ Roof support {5}
289  DF  .~.~.~> Inflatable
290  DF  .~.~.~> Jack {1}
302.1  DF  .~.~.~> Subterranean roof plate
302.2  DF  .~.~.~> Cable or strap support
302.3  DF  .~.~.~> Mesh support

DEFINITION

Classification: 405/288

Roof support:

(under subclass 272) Method or apparatus wherein a tunnel or mine overhead is braced to prevent cave-in.

SEE OR SEARCH CLASS

248, Supports,

351+, for props and braces of general utility.