US PATENT SUBCLASS 266 / 100
.~ Having observation means

Current as of: June, 1999
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266 /   HD   METALLURGICAL APPARATUS

99  DF  WITH RECORDING, INDICATING, INSPECTION OR MEASURING MEANS {1}
100.~ Having observation means

DEFINITION

Classification: 266/100

(under subclass 99) Device wherein means are provided for the visual examination of a portion of the device.