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发明名称
Беструбный, безредуторный электробур
摘要
申请公布号
SU111129(A1)
申请公布日期
1957.11.30
申请号
SU19560563492
申请日期
1956.12.28
申请人
MININ A.A.;POGARSKIJ A.A.;CHEFRANOV K.A.
发明人
MININ A.A.;POGARSKIJ A.A.;CHEFRANOV K.A.
分类号
E21B4/04;E21B21/00
主分类号
E21B4/04
代理机构
代理人
主权项
地址
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