Jennings Slot Machine Repair
This Manual is in a PDF format. I have never found an actual manual for the Jennings Little Duke Mechanical slot machine, so I have put together this package of information, which includes items like adjustments, history, many photo's showing different models, the companies who make reproduction parts for it and what is available in these parts catalogs.
Some of the well known companies who manufactured coin op machines were: Caille Brothers, Watling, O.D. Jennings, Clawson, Griswold, Roover Brothers, Mills Novelty Company, William Gent, Exhibit Supply, International Mutoscope, Pace, Bally Reliance, Chester Pollard, Rock-Ola Manufacturing, Pulver, Manikin Vendor, Hance, Columbus, and Charles Fey. Penny arcades had strength testers, lung testers, fortune tellers, mutoscopes, shooting ranges, rifle or gun games, automatic target practice or skill games, and electricity shock machines. Vending machines came in all different shapes and sizes, and dispensed all different products such as gumballs, peanuts, breath pellets, perfume, stick or package gum, cigars, matches, combs, lighter fluid, collar buttons, stamps, chocolate, and candy. Trade stimulators used various forms to attract customers. Some of the most popular were dice machines, cast iron poker machines, sport theme machines (golf, basketball, football, baseball, boxing), roulette, and horse race machines. The earliest slot machines came in an upright wood cabinet with a single color wheel that spins when the handle was released (Centaur, Eclipse, Lonestar, Big Six, Dewey, 20th Century, Victor, New Century Detroit, Black Cat, Duplex, Peerless, Chicago, Judge, Owl, Bullfrog, Cricket)