Helicopter Sikorsky S-55 Serial 55-981 Register N752A used by Humble Oil and Refining Company. Built 1956. Aircraft history and location Aircraft History N752A Humble Oil and Refining Company 1956-06-13Sikorsky S-55 c/n 55-981, ff:? del Humble Oil as N752A, 13Jun56. S-55T C-GRXA Send Updates Use APP to upload photo @ (optional) When Now? / / Send
