Thanks Dave.
The S.A. Huntley patent for the multi-layer sponge-rubber pad was granted April 10, 1917, Patent No. 1,222,291.
Here's a promo for the Huntley pad in Nov. 1917
Outing
https://books.google.com/books?id=V4...J&pg=PA124&lpg
This is the pad in the 1920 Folsom catalog
