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a plurality of latches extending transversely of the inner face of the inner section of the rim, and lying in contact therewith, each of said latches being pivotally connected to* 5 the inner section of the rim adjacent to one of the side edges thereof and being provided at its free end with a hook to engage the op-
posite side edge of the outer section of the rim, said outer section of the rim having a bulging shoulder for engagement with the 10 hook of the latch. In testimony whereof I affix my signature. HUSTON R. DUGGER.