Inventor of the Maxim silencer for firearms, and inventor of smokeless gunpowder, respectively. Maxim Silencer Company business card, 3.75 x 2, affixed to a slightly larger black slip, signed on the front in fountain pen, “Hiram Percy Maxim, Jan., 2, 1919”; an ink signature and inscription, “To C. E. Lawrence, with compliments of Hudson Maxim, Aug-22-1921,” on an off-white 5.5 x 3.5 card; and an ink signature, “Hiram Stevens Maxim,” on an off-white 6 x 3.5 slip clipped from a larger document. In very good condition, with scattered soiling and a pencil notation to business card, and a rusty paperclip mark and vertical crease to Hudson’s card and Hiram’s slip. RRAuction COA.