发明名称 STANZWERKZEUG
摘要 <p>An improved punching tool having a long wearing characteristic and characterized in having at least first and second punching edges disposed on the leading end of the punch body wherein these punching edges are separated by an annular groove and wherein the trailing punching edge is slightly smaller in diameter than the leading punching edge.</p>
申请公布号 DE3816963(A1) 申请公布日期 1989.11.23
申请号 DE19883816963 申请日期 1988.05.18
申请人 SNEED SONNY, AKRON, OHIO, US 发明人 SNEED SONNY, AKRON, OHIO, US
分类号 B21D28/34;B26F1/14 主分类号 B21D28/34
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