Coil stop used on all Bally pinball machine flipper mechs from 05/1980 to 03-1988 with the exception of Eight Ball Champ and the upper flippers on Medusa.
Bally reference #A-613-127, A-613-115 & A365-00024-0000.
Complete list of usage:
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 1980-05  | 
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 1980-06  | 
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 1980-06  | 
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 1980-07  | 
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 1980-09  | 
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 1980-11  | 
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 1980-11  | 
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 1981-02  | 
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 1981-06  | 
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 1981-06  | 
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 1981-08  | 
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 1981-10  | 
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 1981-12  | 
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 1982-02  | 
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 1982-05  | 
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 1982-08  | 
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 1982-08  | 
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 1982-08  | 
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 1982-10  | 
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 1982-11  | 
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 1983-06  | 
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 1983-10  | 
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 1983-12  | 
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 1984  | 
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 1984-02  | 
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 1984-03  | 
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 1984-07  | 
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 1984-10  | 
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 1985-02  | 
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 1985-05  | 
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 1985-11  | 
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 1986-03  | 
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 1986-06  | 
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 1986-06  | 
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 1986-09  | 
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 1986-11  | 
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 1987-03  | 
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 1987-04  | 
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 1987-05  | 
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 1987-08  | 
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 1987-10  | 
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 1988-01  | 
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 1988-03  |