US PATENT SUBCLASS 33 / 29
.~.~ Stair

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

18.1  DF  SCRIBER {10}
27.01  DF  .~ Curved line {13}
29.~.~ Stair

DEFINITION

Classification: 33/29

(under subclass 27) Devices designed for laying out stair curves.