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6147 companies listed
 
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Manufacturers (92)Years of activities
 O Donoghue [J.D. O Donoghue] [Brooklyn, NY, USA]
        1883 
 O'Meara [John U. O'Meara] [Washigton, DC, USA]
1889 to 1890 
 O-Letto Novelty Co.
 
 O3 Ent.
2005 to 2006 
 Oak Mfg. Co., Inc. [Culver City, CA, USA]
1947 to 1956 
 Oakland Novelty Co. [Oakland, CA, USA]
        1902 
 Oakleaf
 
 OB Machine Co. [Portland, OR, USA]
        1927 
 OBA, Inc. [Dallas, TX, USA]
 
 Oberlander [Oberländer] [Fürth, Germany]
        1905 
 OCC
        1996 
 Ocean Software, Ltd.
1984 to 1998 
 Octavian Italy srl [Bussolengo, VR, Italy]
        2010 
 Odrex [Odessa, Ukraine]
 
 OEC [Omori Electric Co.] [Japan]
1979 to 1983 
 OFA [Paris, France]
 
 Office Koukan [Japan]
        1990 
 Ogden & Co. [Chicago, IL, USA]
1897 to 1901 
 Ohio Amusement Co. [Columbus, OH, USA]
        1944 
 Ohio Automatic Machine Co. [Cincinnati, OH, USA]
        1930 
 Ohio Match Co. [OH, USA]
 
 Ohio Specialty Co. [Cincinnati, OH, USA]
1935 to 1949 
 Ohio Vending Machine Co. [Columbus, OH, USA]
1930 to 1934 
 Ohira Giken Industry Co., Ltd. [Japan]
        2005 
 OHMCO Inc. [New Mexico, USA]
 
 OIC
 
 OIC Co. [Chicago,. IL, USA]
        1916 
 Oizumi
2001 to 2008 
 Oizumi Neo [Olympia Group] [Japan]
        2009 
 OK Corp.
        1985 
 OK Mfg. [Salt Lake City, UT, USA]
2006 to 2007 
 Okazaki Sangyo Co., Ltd. [Japan]
1991 to 2012 
 Oksan
        1992 
 Okumura [Japan]
1972 to 2008 
 Okumura Yuki Co., Ltd. [Japan]
2008 to 2011 
 Okumurayuuki Corp. [Japan]
        2011 
 Olde N.Y. Amusement Factory [USA]
 
 Oliver [Thomas Oliver] [Chicago, IL, USA]
        1908 
 Oliver [William S. Oliver] [London, England, UK]
        1887 
 Olympia [Milan, Italy]
1979 to 1983 
 Olympia Co., Ltd. [Japan]
1993 to 2012 
 Olympic Games Mfg. Co.
 
 Olympic Video Gaming
 
 Omega [Paris, France]
        1937 
 Omega Micott
        2002 
 Omega Project Co., Ltd. [Japan]
        2002 
 Omega System
        1999 
 Omen
 
 Omiya Soft
1997 to 1998 
 Omni
1980 to 1981 
 One-Cent Amusement Co. [Camden, NJ, USA]
        1929 
 One-Use Toothbrush Corp. [Van Nuys, CA, USA]
 
 Open Book 9003
        1996 
 Open Corp.
        1993 
 Oper-Video
        2000 
 Opera Soft
        1990 
 Operator's Piano Co. [Chicago, IL, USA]
        1920 
 Operators Guide
 
 Operators Supply Co.
 
 Operators Vending Machine Supply Co. [Los Angeles, CA, USA]
1932 to 1939 
 Opitz [Erich Opitz] [Berlin, Germany]
        1939 
 Optima
        1983 
 Optyx
 
 Opus
 
 Opus Ent., Ltd. [Surrey, UK]
 
 Orange Micro
        1984 
 Orca [Japan]
        2010 
 Orca Corp. [Japan]
1981 to 1983 
 Oriental Soft Japan
2000 to 2002 
 Oriental Soft, Inc.
        2000 
 Origin
1994 to 1998 
 Origin Systems
        1990 
 Original Amusements Co. [Southend-on-Sea, UK]
        1930 
 Original Game
        1982 
 Original Machine Co.
 
 Original Machine Mfgrs. [Southend, England, UK]
1932 to 1946 
 Orion Gaming
        2010 
 Orms Mfg. Co. [Dallas, TX, USA]
        1956 
 Ortiz Gaming
 
 Osbrink Games Co. [Chicago, IL, USA]
        1934 
 Osbrink Mfg. Co. [R.H. Osbrink] [Chicago, IL, USA]
1933 to 1934 
 Osch [Jos van Osch] [Holland]
        1958 
 Ostelbische Automaten
        1928 
 Ostjysk Automater [Østjysk Automater]
        1979 
 Otomato [Paris, France]
        1936 
 Otto & Sons [F.G. Otto] [Jersey City, NJ, USA]
1898 to 1899 
 Otto Wichelhaus
        1930 
 Outer Limits
        1981 
 Outrigger
1995 to 1997 
 Overton Mfg. Co. [Topeka, KS, USA]
        1902 
 Own-A-Phone
        1987 
 OZ Club
1996 to 1997 
 

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