Zar
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| Companies of Chicago (Illinois) |
| Adams & Westlake | Central Camera Co. | American Advertising and Research Co. | Bernard | Burke & James | Busch | Calumet | Candid | Chicago Aerial | Chicago Camera Co. | Chicago Ferrotype Company | Deardorff | De Vry | Drucker | Galter | Geiss | Herold | Imperial | Kemper | Lennor Engineering Co. | Metropolitan Industries | Monarch | Montgomery Ward | Pho-Tak | QRS Company | Rolls | Sans & Streiffe | Sears | Seymour | Spartus | The Camera Man | United States Camera Co. | Western Camera Manufacturing Co. | Yale | Zar | Zenith |
| Chicago in depth: The Chicago Cluster, a bakelite trust? |
