Patent for invention (certificate No. 3306023) a special chromium-free anti-fing

Patent for invention (certificate No. 3306023) a special chromium-free anti-fing

Certificate of invention single page (certificate No. 2237541)

US patent 3

U.S. patent 2

U.S. patent 1

Single page of invention patent certificate (Certificate No.: 2737641)

Single page of invention patent certificate (Certificate No.: 2237541)