BALLY E SERIES 809, 831, 873 Slot Machine Parts Catalog | eBay
1966 Bally 5-cent Double Up Fruit Slot Machine #808-b - Clix Auctions LLC
Bally Slot Machine, Model 809 B, C. 1964, 25 Cent,
Bally Model S9000 Slot Machine GETT Part GPC104 - GET-T
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My BALLY 809 Multiplier
Bally 809 P Slot Machine re-birth ! - YouTube
SOLVED: The author purchased a slot machine (Bally Model 809 ), and tested it by playing it 1197 times. When testing the claim that the observed outcomes agree with the expected frequencies,