Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"FETZER KARL M" Page 1

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发明授权
Testing equipment 失效
Title translation: 测试设备

公开(公告)号：US2402617A

公开(公告)日：1946-06-25

申请号：US52156644

申请日：1944-02-08

Applicant: BELL TELEPHONE LABOR INC

Inventor： FETZER KARL M , HOYT FREDERICK A

IPC: F41G7/00 , F42B19/10

CPC classification number: F41G7/00 , F42B19/01

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