I know Arch/Truss bars were also made after 1933, but the majority were earlier. >Drop bar (Camel back)~ drops near saddle for ease of mounting. (not what I wish here) >Arch (basically double arch)~ dual curved/bent top tubes >Truss bar~ a straight or dropped upper top tube connected in some means with a lower curved or bent tube. Manufacturers / Brands Columbia Davis Sewing Machine - Dayton, Harley Dayton - Victor Great Western - Adlake, Crown Haverford - Black Beauty Pacer Hendee-Indian H.P. Snyder - Rollfast Iver Johnson Mead Miami Rollfast Schwinn - Excelsior, Henderson, The World Sears & Roebuck - King Simmons - Westminster Victor Westfield - Cleveland, Crescent, Jewel, Pope, Rambler, Seminole, Tribune Anyone with comments as to dates made, other manufacturers, of informative nature or images feel free to post, but please no other comments. This will be an informative thread only. Thank you.