Method for printing bar-codes
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United States of America Patent
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-
May 30, 2000
Grant Date -
N/A
app pub date -
Jun 13, 1997
filing date -
Jun 27, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The bar-code printing method of the present invention comprises a step of irradiating the circumferential surface of a metal tube with laser beams so as to make at least one group of thin elementary lines arranged in parallel with each other at intervals. The width of the intervals is determined so that each group of elementary lines can be detected as one of the thick lines contained in the bar-code.
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