Original vintage optical industry trade magazine ad for LEEDS AND NORTHRUP COMPANY of Philadelphia, PA. Parasitic E.M.F.'s Practically Eliminated. High Sensitivity Low Resistance Galvanometer. Old 1923 optical laboratory equipment advertisement.
leeds northrup company 1923 parasitic emf eliminated vintage ad
- Product Code: s293
- Length: 9 inches
- Width: 6 inches
- Pages: 1
- Views: 97
- Availability: In Stock
- $20.00
$15.00
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