Originally Posted by Calhoun
Aha.. thanks for that. Patent for G&H was 1929? I think, how early was the Noske?

https://worldwide.espacenet.com/patent/search/family/022823602/publication/US1756603A?q=us1756603

Last edited by GeneB; 01/22/20. Reason: changed link to display the corrct patent

Gene