| 摘要 |
An improved cartridge comprising an outer case member, an inner base member and an intermediate bushing member wherein the case may be plastic or similar material, the inner base member is of plastic or any other material, and the bushing member formed by injection between the case member and the base member. The intermediate bushing formed and interposed between the case member and the base member closely joins the case to the base to form a monobloc assembly.
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