Opps, I forgot this one...
Now there are 20 candidates...
I'll exclude Bauley & Knutson, Beetle-Flyer, Belmont, Bertolet, Bertzchy, Bingman, Bluebird, Brictson, Brownie, Buckeye, Burdick, (wrong year, different appearance and no relation with other makers, except for Brownie, connected with LaFrance)
I think Bergdoll, Berkshire and Black Crow are out as well, because not that obscure.
I'll try Brunner from Buffalo.