Tamper-proof ball valve
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United States of America Patent
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Nov 18, 2003
Grant Date -
N/A
app pub date -
Jun 10, 2002
filing date -
Jun 10, 2002
priority date (Note) -
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Abstract
A tamper-resistant by-pass valve prevents an unauthorized user from tampering with the valve when it is in the closed position to block gas flow to a meter being replaced or repaired.
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