US PATENT SUBCLASS 708 / 678
.~.~.~.~ By electronic tube

Current as of: June, 1999
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708 /   HD   ELECTRICAL COMPUTERS: ARITHMETIC PROCESSING AND CALCULATING

100  DF  ELECTRICAL DIGITAL CALCULATING COMPUTER {10}
200  DF  .~ Particular function performed {26}
490  DF  .~.~ Arithmetical operation {27}
670  DF  .~.~.~ Addition/subtraction {11}
678.~.~.~.~ By electronic tube

DEFINITION

Classification: 708/678

By electronic tube:

(under subclass 670) Subject matter wherein the addition or subtraction is performed utilizing an electronic tube.