Patent search ap:("WINDRAM HAROLD A") AND inv:"WINDRAM HAROLD A" Page 1

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发明授权
Foldable chalkboard 失效
Title translation: 可折叠黑板

公开(公告)号：US3034230A

公开(公告)日：1962-05-15

申请号：US85444859

申请日：1959-11-20

Applicant: WINDRAM HAROLD A

Inventor： WINDRAM HAROLD A

IPC: A47B97/08 , B43L1/04

CPC classification number: A47B97/08 , B43L1/04

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