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Patent US3398186 - Production of humic acid - Google Patents
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Patent US3398186 - Production of humic acid - Google Patents
Website URL:
https://www.google.com/patents/US3398186
Category:
Security Cameras
Leonardite was finely ground and was extracted with the above solution under ... References Cited UNITED STATES PATENTS 2,815,329 12/1957 Germain 260-515 …
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