Combined Air-Hose Coupling and Stop-Valve.
Description:
Patent for a combined air-hose coupling and stop-valve. One must shut off the cut-off valve before the coupling can be disconnected. When the valve is closed, air pressure is balanced so the couplings can be safely disconnected, and prevents dirt from getting into the train-pipe.
Date:
August 18, 1896
Creator:
Heidelburg, Samuel R.
Item Type:
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