This definition appears somewhat frequently
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Samples in periodicals archive:
Midwest Valve Parts Supply Company, Inc. provides replacement control valve parts for valve remanufacturers, as well as end users in mining, oil fields and petroleum distribution; steam and electric power generation; and such process industries as refineries, petro-chemical, corrosive chemical and pharmaceutical companies.
New disc brake proportioning valve / distribution block seal and rebuild kit for the Mercury Cougar or Ford Mustang / Torino. Every... #26148 - Rebuild / Seal Kit - Brake Proportioning Valve / Distribution Block - Disk Brake - New ~ 1967 - 1969 Mercury Cougar / 1967 - 1969 Ford Mustang / Torino