US PATENT SUBCLASS 217 / 101
Current as of: June, 1999
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(under subclass 100) Subject matter comprising valves for relieving excessive pressure within the barrel.
SEE OR SEARCH CLASS
137, Fluid Handling,
455+, for pressure relieving valves of general utility.
435, Chemistry: Molecular Biology and Microbiology,
286.6+, for safety devices which maintain a uniform pressure in a system of connected barrels.