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square Fresnel lens
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square Fresnel lens, plastic (250 mm x 250 mm) by Combined Optical Instruments, Slough, England, 1975.
Details
- Category:
- Optics
- Object Number:
- 1975-401
- Materials:
- plastic (unidentified)
- Measurements:
-
overall: 4 mm x 286 mm x 286 mm, , .16kg
- type:
- fresnel lens
- credit:
- Combined Optical Instruments Limited