The Mills Duplex © 1899 Mills Novelty.
A 10-slot machine.
Size : 77x37x29 inches.
Machine's picture.
Collector's Guide to Vintage Coin Machines - Richard M. Bueschel - Page 17
100 ans de Machines à Sous - Jean Lemaitre - Éditions Alternatives - 1997 - Page 83
For Amusement Only - Thomas Gustwiller - Taylor Printing - 1995 - Page 8
Loose Change Blue Book for Slot Machines [4th Edition]