US PATENT SUBCLASS 137 / 84
.~ Plural series units

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

82  DF  PRESSURE MODULATING RELAYS OR FOLLOWERS {3}
84.~ Plural series units

DEFINITION

Classification: 137/84

(under subclass 82) Apparatus wherein a plurality of modulating relays on followers are connected in series; the output pressure of one controlling the modulation in the next.