The Bally-Midway-Williams records contain documentation from the Bally, Midway, and Williams pinball companies, with the bulk of the materials dated between 1947 and 1993. Materials within this collection include parts lists, bills of materials (BOMs), memos, notes, correspondence, reference, playfield drawings, parts diagrams, wiring diagrams, engineer change notices (ECNs), copyright registration information, tradename search reports, engineering logbooks, packaging testing information, and some financial documentation. The majority of information in this collection is on pinball games, though documentation on video arcade games, slot machines, billiards, and other amusements is also present. Additional scope and content information can be found in the “Contents List” section of this finding aid.
The Bally-Midway-Williams records are arranged into three series, one of which is further divided into subseries (and sub-subseries). The physical materials are housed in 108 archival document boxes and one map case drawer.