Overhead abacus
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United States of America Patent
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N/A
Issued Date -
Oct 12, 2006
app pub date -
Jun 3, 2003
filing date -
Jun 3, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An abacus including a frame, a plurality of wires supported by the frame, and a plurality of counting members coupled to the wires for movement along the wires. The counting members are substantially translucent so to allow light to pass therethrough.
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