US PATENT SUBCLASS 48 / 69
.~.~ Water-seal pit

Current as of: June, 1999
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48 /   HD   GAS: HEATING AND ILLUMINATING

61  DF  GENERATORS {4}
62 R  DF  .~ Cupola {18}
69.~.~ Water-seal pit

DEFINITION

Classification: 48/69

Cupola structures having an open bottom and a basin or trough for water, forming a seal for closing said open bottom and through which the ash is removed.