Invention Grant
- Patent Title: Light projector using fresnel lens
- Patent Title (中): 光投影仪使用菲涅尔透镜
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Application No.: US57715522Application Date: 1922-07-24
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Publication No.: US1650591APublication Date: 1927-11-29
- Inventor: BEECHLYN JOHN T
- Applicant: GEN ELECTRIC
- Assignee: Gen Electric
- Current Assignee: Gen Electric
- Priority: US57715522 1922-07-24
- Main IPC: G03B21/20
- IPC: G03B21/20
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