| 摘要 |
<p>A movable platform is confined for movement about an axis, that platform supports a bottle for liquefied petroleum gas, an indicating means is movable when tat platform moves, and spring means urge that platform to move in a direction which will move that indicating means toward an "empty" position, but that spring means will yield to permit a "full" bottle to hold that platform in a position wherein that indicating means is spaced away from that "empty" position.</p> |
