Patent search ap:("INT BASIC ECONOMY CORP") AND inv:"RUSSELL ROBERT P" Page 1

1.

发明授权
Apparatus for forming underground drainage and irrigation openings 失效
Title translation: 用于形成地下排水和灌溉开口的设备

公开(公告)号：US2680416A

公开(公告)日：1954-06-08

申请号：US21737251

申请日：1951-03-24

Applicant: INT BASIC ECONOMY CORP

Inventor： RUSSELL ROBERT P

IPC: E02B11/02 , E02F5/10

CPC classification number: E02F5/101

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