| 摘要 |
<p>A device is disclosed which comprises basically a door lifting deck and a first class lever having its resistance end pivoted about a lever axle perpendicular to the lever, which axle is carried on the door lifting deck a predetermined distance away therefrom, having a fulcrum which consists of a truck attached to the lever and mounting at least one idle wheel, and having its power end fashioned into a handgrip.</p> |
