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发明名称
Improvements in wood-screws
摘要
325,451. Grohmann, L. Nov. 10, 1929. Wood-screws. - A woodscrew has the external diameter of its thread 1 gradually increasing towards the point, whilst its core diameter gradually decreases in the same direction.
申请公布号
GB325451(A)
申请公布日期
1930.02.20
申请号
GB19290017763
申请日期
1929.06.10
申请人
LOTHAR GROHMANN
发明人
分类号
F16B25/00
主分类号
F16B25/00
代理机构
代理人
主权项
地址
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