| 摘要 |
A lug is inserted between the ears (24) of a mount (20) and a pin is inserted through the aligned bore of lug, such that pressure gauge is pivotally connected to the mount. Two radial holes of lug communicate with air passage, when gauge is in storage and operative positions. Cylinder (10) of pressure gauge (40) has a large chamber and relatively small chamber which communicates with each other. A mount (20) is mounted on top of the cylinder. An air passage connectable with the small chamber is provided in the mount.
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