Original vintage optical industry trade magazine ad for W. M. WELCH SCIENTIFIC COMPANY of Chicago, IL. Further Improvements and Reduced Price on the Source of Light for the Optical Disc. No. 3682, 3677, 3675. Diverging Ray Attachment. Old 1923 laboratory instruments advertisement.
w m welch scientific company 1923 improvements optical disc vintage ad
- Product Code: s303
- Length: 9 inches
- Width: 6 inches
- Views: 28
- Availability: In Stock
- $20.00
$15.00
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You save: $5.00 (25%)
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