Railway switches and signals – Electric automatic highway signals – mine doors – and gates
Reexamination Certificate
2006-02-14
2006-02-14
Le, Mark T. (Department: 3617)
Railway switches and signals
Electric automatic highway signals, mine doors, and gates
C246S127000, C246S473100, C049S049000, C049S124000
Reexamination Certificate
active
06997417
ABSTRACT:
A railroad crossing gate with a gate assembly. An extendible member slides within an outer member with minimal friction. When the gate is in its open position, gravity retracts the extendible member to hollow member. When the gate is in its blocking position, gravity causes the extendible member to move out of the hollow member to a final blocking position.
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Herbster George A.
Le Mark T.
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