| Year | 1955 |
| Date | 25-Aug |
| Volume | 113 |
| Issue | 2,831 |
| Page | 219 |
| Category | Pump |
| Part | |
| Title | Rotary Pumps and Motors. Radial and Swashplate Piston Pumps |
| Author | "Artificer" |
| Notes | Lockheed Mark 7 hydraulic, elevations of the Mono-radial, cam-operated double-ball plunger axial, fixed capacity 7-barrel swashplate, the Rotoplunge pump, ball plunger pumps, swashplate pumps and motors, conclusion |