欠款英文专利名称：Breakable composite drill screw 发明人：Katsumi Shinjo
opps
申请号：US07/430845
contact是什么意思申请日：19891101
公开号：US04958972A
get loo公开日：
warm19900925
考研报考类别
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yielding
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摘要：A breakable composite drill screw compris a first shank made of a metal unsusceptible of hardening, a driving head extending from one end of the first shank and engageable with a screw driving tool, a cond shank made of another metal susceptible of hardening, the cond shank being fixedly adjoined to the other end of the first shank to thereby provide a break zone at said other end, a drill bit formed by cold forging at an end of the cond shank, a continuous thread formed by thread-rolling to extend around both outer cylindrical peripheries of the first and cond shank wherein a portion extending from the break zone to the drill bit is hardened or quenched, and wherein said shanks are adjoined at their engaging surfaces to each other by projection-welding technique making u of a welding lug protruding from either engaging surface, said lug forming the break zone.英语字典在线查询
申请人：YUGEN KAISHA SHINJOSEISAKUSHO
代理机构：Jordan and Hamburg不要介意的英文
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