Pong, the Atari creation that launched the computer game craze, came with these instructions: "Avoid missing ball for high score."
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| Number | Title | Issue Date |
| 8047141 | Step actuator A step drive for a movable step, the step drive being arranged below a swinging-sliding door. The step drive includes an opening-out mechanism located in a lower region of a secondary closing edge of the swinging-sliding door. The opening-out mechanism is connected ... | 11/01/2011 |
| 7025004 | Passenger rail car sliding door with high platform threshold An improved door assembly has a single movable door and may have a separate movable high platform threshold. The door assembly is formed of an upper door section and a lower door section which is fixed to the upper door section. A support member may be integral with... | 04/11/2006 |
| 6591760 | Door for a railway vehicle A portal system for a railway or other vehicle having steps from the interior flooring downwards to the ground has a bridge platform to be deployed for use when the vehicle is stopped at a railway station platform. A threshold member closes at least part ... | 07/15/2003 |
| 6401629 | Door for railroad car The invention relates to a door for a railway vehicle, intended for a door opening having steps, on which there are provided a platform and a threshold above the steps to permit disembarking onto a railway platform situated higher than the steps. The inve... | 06/11/2002 |
| 6263804 | Dual level access door system for railway vehicles A door system for a railway car which provides for both high and low level access. The door system comprises a sliding door, a platform displaceable between raised and lowered positions for respectively clearing and covering the stairwell of the railway c... | 07/24/2001 |
| 5921531 | Retractable handrail for railroad cars A handrail assembly for access walkways on railway hopper cars is movable between a retracted position, where the assembly is stored for transit, and an extended position where the posts and rails of the assembly are raised to provide a protective barrier... | 07/13/1999 |
| 4453684 | Step operated locking mechanism for aircraft lower door Upper and lower sectional doors of rectangular configuration are mounted within an aircraft fuselage door frame and hinged for pivoting about horizontal axes at the upper and lower horizontal edges of respective door sections. A step is mounted to the int... | 06/12/1984 |