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    McKinney Petroleum Equipment, Inc.
    AL, United States
    Sell and service petroleum ...
       
    RJ Engineering Systems, Inc.
    TX, United States
    RJ Engineering Systems is a...
       
    PENRECO
    TX, United States
    PETROLEUM REFINING...
       
    CONOCOPHILLIPS
    TX, United States
    PETROLEUM REFINING...
       
    SHELL PETROLEUM INC
    TX, United States
    PETROLEUM REFINING...
       
    CITGO PETROLEUM CORPORATION
    OK, United States
    PETROLEUM REFINING...
       
    VALERO ENERGY CORPORATION
    TX, United States
    PETROLEUM REFINING...
       
    VALERO REFINING AND MKTG CO
    TX, United States
    PETROLEUM REFINING...
       
    CHEVRON CORPORATION
    CA, United States
    PETROLEUM REFINING...
       
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