| 摘要 |
There is an outwardly directed rolled flange (25) on the upper edge (8) of the body (3). There are several outwardly directed bulges (27), with their apex lying on a circle line, on the plane of the opening lying contour of the rolled flange. The bulges attach radially inside the circle line lying sections (29).The bulges form a rounded corner of several corners and they may connect with a straight or curved section (29). The body of the barrel may be necked at the opening and the apex of the bulges may lie on the body surfaces.
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