US PATENT SUBCLASS 156 / 46
.~.~.~ Perforating

Current as of: June, 1999
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156 /   HD   ADHESIVE BONDING AND MISCELLANEOUS CHEMICAL MANUFACTURE

1  DF  METHODS {7}
39  DF  .~ Plaster board making {6}
45  DF  .~.~ With subsequent treatment of plaster board {1}
46.~.~.~ Perforating

DEFINITION

Classification: 156/46

(under subclass 45) Processes in which the modification is the formation of an aperture.

(1) Note. The aperture need not necessarily extend through the entire body but may stop short of penetrating the second facing sheet.

SEE OR SEARCH THIS CLASS, SUBCLASS:

252, for processes of forming apertures in lamina.