In late 1931, it was the War Eagle and the Roman Head, and in 1933, it was the Castle Front. Another innovation came along in the history of slots in the mid-1900’s, with the introduction of Big Bertha and Super Big Bertha, the first slots driven by a machine. These slots had eight reels, with 20 symbols on each.
Katika mwishoni mwa 1931, ilikuwa ni Eagle Vita na Mkuu wa Roma, na katika 1933, ilikuwa ni Front Castle. innovation mwingine hapo pamoja katika historia ya inafaa katika katikati ya miaka ya 1900, pamoja na kuanzishwa kwa Big Bertha na Super Big Bertha, inafaa kwanza inaendeshwa kwa mashine ya. Haya inafaa alikuwa reels nane, pamoja na ishara 20 kila.