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公开(公告)号：US1885293A
公开(公告)日：1932-11-01
申请号：US42289130
申请日：1930-01-23
Applicant: ROBERT ROBERTSON JAMES
Inventor： ROBERT ROBERTSON JAMES
IPC: G03B31/00
CPC classification number: G03B31/00
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公开(公告)号：US1812558A
公开(公告)日：1931-06-30
申请号：US24605628
申请日：1928-01-11
Applicant: ROBERT ROBERTSON JAMES
Inventor： ROBERT ROBERTSON JAMES
IPC: H01J61/94
CPC classification number: H01J61/94
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