| 摘要 |
Apparatus for measuring the headspace of the case of a cartridge using a caliper having a fixed blade and a movable blade composing a body member attached to one of the blades of the caliper. The body member has a longitudinally extending bore into which is inserted an annular extension of a bushing, the bushing having a bore preselected to be equal to or substantially similar to the datum reference circle of a case of the cartridge, the headspace of which is to be measured.
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