http://www.picturetrail.com/sfx/album/view/22972603
Pre-WWI pads included the D&W, Funkes, Huntley Shock Absorber (Omaha) and "Perkins" Recoil Pads (both advertised starting in 1915), Tryon #6, and the American Silver pad - sometimes called Grieb and after about 1915 Goodrich; possibly by the Ajax-Grieb Rubber Co.