Original vintage optical industry trade magazine ad for LEEDS AND NORTHRUP COMPANY of Philadelphia, PA. Features of L & N Recorders for Laboratory Use. Measures temperature, current, voltage, intensity of daylight, purity of gases, humidity, and chemical characteristics and solutions. Old 1922 old electrical measuring instrument advertisement.
leeds northrup company 1922 recorder for laboratory use vintage ad
- Product Code: s244
- Length: 9 inches
- Width: 6 inches
- Pages: 1
- Views: 25
- Availability: In Stock
- $20.00
$15.00
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