US PATENT SUBCLASS 123 / 184.54
.~.~ With back flow prevention valve

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

184.21  DF  INTAKE MANIFOLD {8}
184.53  DF  .~ Manifold tuning, balancing or pressure regulating means {6}
184.54.~.~ With back flow prevention valve

DEFINITION

Classification: 123/184.54

With back flow prevention valve:

(under subclass 184.53) Intake manifold including a one-way valve for restricting the flow of working material to one direction.