1,002,715. Internally meshing gear pumps; hydraulic apparatus. HYDRO DRIVE CORPORATION. April 17, 1964 [April 22, 1963], No. 15993/64. Headings F1F and F1P. [Also in Divisions B7 and F2] A rotary oil pump 24 for use in a hydraulic system in an outboard drive unit for boats (see...