Patent search ap:("FOUST JOHN L") AND inv:"FOUST JOHN L" Page 1

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发明授权
Exposure meter having object and comparison gray scale means 失效
Title translation: 具有对象和比较灰度等级的曝光表

公开(公告)号：US2491654A

公开(公告)日：1949-12-20

申请号：US69514146

申请日：1946-09-06

Applicant: FOUST JOHN L

Inventor： FOUST JOHN L

IPC: G01J1/12

CPC classification number: G01J1/124

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