US PATENT SUBCLASS 291 / 18
JET IN HOPPER
Current as of: June, 1999
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DEFINITION
Classification: 291/18
An air or steam jet discharges into the top of the hopper for effecting pressure on the mass of sand or discharges into the mass of sand for the purposes of heating, drying, or breaking up caked sand. This subclass does not include devices for blowing sand out of the hopper.
