| 摘要 |
An add on signalling apparatus (10) for wheel ramps (50) to warn the operator of a vehicle (100) when one of the wheels (101) of the vehicle (100) has reached a selected location on the horizontal support surface (52) of the wheel ramp (50) by the movement of a pressure plate member (23) against a push button (17) to energize a power source (16) to provide electrical current to an elevated source of illumination (31).
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