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发明名称
Perfectionnements apportés dans l'établissement de trous d'homme et aux couvercleset châssis de visite
摘要
申请公布号
FR936267(A)
申请公布日期
1948.07.15
申请号
FRD936267
申请日期
1946.11.23
申请人
发明人
ELEKINGTON VIVIAN
分类号
F16J13/18
主分类号
F16J13/18
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