The original contract between Peltier and Gropper was signed on August 18th, 1924, and was tentatively set to last for a period of ten years, but they decided to terminate the contract before that time, and did so on June 9th,1931.
Peltier was to buy four marble machines, Peltier paying 1/3, and Gropper paying 2/3
Peltier was to supply and pay for all other necessary machinery, equipment, materials, and supplies.
The Miller contract was signed September 3rd, 1924
M. Gropper & Sons was at the 200 Fifth Avenue, New York,N.Y. address.
The Ottawa address was a room at the Peltier factory, as near as I can tell.
Peltier was to manufacture the marbles, and pack them in containers, and Gropper was to sell them.
Peltier did not sell any marbles on their own until after the contract with Gropper terminated.