 
                 Tulsa, OK, US
 Tulsa, OK, US
                     Petro-Chem Development Co. Inc.
                                    Petro-Chem Development Co. Inc.
                                 William C. Gibson
                                    William C. Gibson
                                 F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
                                    F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
                                 Petro-Chem Development Co., Inc.
                                    Petro-Chem Development Co., Inc.
                                 William C. Gibson
                                    William C. Gibson
                                 G01 - MEASURING TESTING
                                    G01 - MEASURING TESTING
                                 Petro-Chem Development Co. Inc.
                                    Petro-Chem Development Co. Inc.
                                 William C. Gibson
                                    William C. Gibson
                                 C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
                                    C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
                                 Petro-Chem Development Co. Inc.
                                    Petro-Chem Development Co. Inc.
                                 William C. Gibson
                                    William C. Gibson
                                 C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
                                    C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
                                 Petro-Chem Development Co., Inc.
                                    Petro-Chem Development Co., Inc.
                                 William C. Gibson
                                    William C. Gibson
                                 F24 - HEATING RANGES VENTILATING
                                    F24 - HEATING RANGES VENTILATING