Original vintage optical industry trade magazine ad for LEEDS AND NORTHRUP COMPANY of Philadelphia, PA. The Standard for Hydrogen Ion Determinations. H-ion. Type K Potentiometer Equipment for measurements of extreme precision. Old 1923 laboratory electrical measuring instruments advertisement
leeds northrup company 1923 hydrogen-ion determination vintage ad
- Product Code: s295
- Length: 9 inches
- Width: 6 inches
- Pages: 1
- Views: 23
- Availability: In Stock
- $20.00
$15.00
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