| Source: Mercantile and Manufacturing Scrapbooks, circa 1948-1977 Location: Reading Room / St.L. / 658 / M533 | |
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| Corporate Name: | American District Telegraph Co. (ADT) |
| Address: | 4020 Clayton Ave. |
| Volume: | 8 |
| Page: | 117 |
| Remarks: | "ADT Chooses LaSalle Park Site," 1977 |
