.50 GALLAGER CARBINE with drawn brass case… Frankford Arsenal and Richardson & Overman of Philadelphia
MAYNARD, MODEL 1865 CARTRIDGES… Frankford Arsenal and Pitman
.56 BILLINGHURST REQUA MITRAILLEUSE… H.P. White Co.
.42 CUP-FIRE Don’t know, but I think the smaller ones were made by American Metallic Cartridge Co. and Phenix Cartridge Co. (going on memory here).
The information on the Gallager, Maynard and Reque comes from:
"Handbook of Civil War Bullets and Cartridges"
James E. Thomas & Dean S. Thomas, Thomas Publications, Gettysburg PA. 1996
"Small Arms and Ammunition in the United States Service, 1776-1865"
Col. Berkeley R. Lewis U.S. Army Ord. Corp, Smithsonian Institution, Washington D.C. 1956, reprint 1960.