| Name | Summary | Parent Co. | Child Co. | Is Base Co. |
|---|---|---|---|---|
| Columbia Time Products | A name Westclox used ca. the 1950s - 1960s on some private label or lower priced clocks. | Westclox | No | |
| Eastern Time Limited | Hong Kong, maker of clocks and movements for Westclox. Founded ca. 1964. | Westclox | No | |
| General Electric | Part owner of Warren Telechron Company. Marketed clocks with the General Electric name. | Telechron | No | |
| General Electric Telechron | Name used in the mid-1950s on clocks. | Telechron | No | |
| General Time Corporation | Holding company for Westclox and Seth Thomas starting in 1949. | General Time; Seth Thomas; Westclox | No | |
| General Time Instruments Corporation | Holding company for Westclox and Seth Thomas 1936 - 1949. | General Time; Seth Thomas; Westclox | No | |
| Plymouth | Name used by Seth Thomas in the 1930s - 1950s for a lower priced lines of clocks. | Seth Thomas | No | |
| Regent Mfg. Co. | Chicago. Made cast front cases that often housed Western Clock Clock Manufacturing Company or Western Clock Company movements. | No | ||
| Revere | The Revere Clock Company, Cincinnati, Ohio, U.S.A. Made chime and strike clocks using Telechron motors. | Telechron | No | |
| Seth Thomas Clock Company | Before Seth Thomas was part of General Time | Seth Thomas | No | |
| Swartzbaugh | The Swartzbaugh Mfg. Co. Toledo, Ohio. Maker's name on the Everhot Appliance Timer made by Westclox. | No | ||
| Telechron Inc. | Telechron, Inc. ca. the 1950s | Telechron | No | |
| Timex | Brand of popular-priced wrist watches (and a few clocks). In 1922, Waterbury Clock Company purchased the Robert H. Ingersoll & Bro. company. In 1944, Waterbury Clock Co. was renamed U.S. Time Corp . . . | Waterbury Clock | No | |
| United Clock Company | Founded by Charles Stahlberg, et. al. in 1885. | Westclox | No | |
| United Time Products | A name Westclox used ca. the 1930s - 1950s on some private label or lower priced clocks. | Westclox | No | |
| Warren Clock Company | Henry Warren's first company | Telechron | No | |
| Warren Telechron Company | Henry Warren's second company | Telechron | No | |
| Westclox Canada Talley Industries | Westclox Canada, Talley Industries, a division of Talley Canada Inc. | Westclox | No | |
| Westclox Div. General Time Canada | Westclox Division General Time of Canada Limited; Peterborough, Canada. | Westclox | No | |
| Westclox Div. General Time Canada Talley | Westclox Division General Time of Canada Limited, A Talley Industries Company; Peterborough, Canada. | Westclox | No | |
| Westclox Division of General Time Corporation | Starting in 1949 | Westclox | No | |
| Westclox Division of General Time Instruments Corporation | This name used when General Time Instruments Corporation was formed in 1936. | Westclox | No | |
| Western Clock Company Ltd. Canada | Western Clock Company, Ltd., Peterborough, Canada | Westclox | No | |
| Western Clock Company (the first one, 1887 - 1888) | Started in 1887. | Westclox | No | |
| Western Clock Company (the second one, 1912 - 1936) | Starting in 1912 | Westclox | No | |
| Western Clock Manufacturing Company | Starting in 1888 | Westclox | No | |
| Accurate Time Stamp Company | West Virginia. Some Stahlberg patents are assigned to this company. | Yes | ||
| A. L. Swift | Chicago. Name seen on dials of the cast iron stove clock. | Yes | ||
| American Cyanamid Company | Manufacturer of Beetle® and Melmac® molded plastics for clock cases, telephone housings, etc. Address given as PLASTICS DEPARTMENT, 34 Rockefeller Plaza, New York 20, N.Y. in a 1950 advertisement. | Yes | ||
| Ansonia | The Ansonia Clock Co. has its roots in Bristol, CT. Theodore Terry, nephew of Eli Terry, and F. C. Andrews formed the firm Terry & Andrews in 1841 to manufacture inexpensive brass movement clocks. The . . . | Yes | ||
| Arnex | Maker of reproduction watches with mechanical movements in the 1970s. | Yes | ||
| Bulova | Bulova Watch Company. Imported Swiss watch movements and cased them in the USA. | Yes | ||
| Catalin Corporation of America | Manufacturer of Catalin plastic used in clock cases. Address: One Park Avenue, New York 16, N.Y. in 1947 advertisement. | Yes | ||
| Chelsea | Chelsea Clock Company. Founded in 1884 as Boston Clock Company, became Chelsea in 1897. Well known for ship's bell clocks. Still making clocks in the USA. | Yes | ||
| Deemer Mfg. co. | Chicago, IL. Name on the back of the case iron stove clocks. | Yes | ||
| Dura Company | Toledo, Ohio, maker of cast cases such as the Westclox Dura Case models | Yes | ||
| E. Howard Watch Co. | Base company for E. Howard and Howard watches | Yes | ||
| Eico | Maker of electronic kits including hi-fi, stereo and test equipment. Electronic Instrument Company, Inc. 33 - 00 Northern Blvd., Long Island City 1, N.Y. Eico pioneered build-it-yourself kits for test . . . | Yes | ||
| Elgin | Made watches in the USA from 1864 to 1968. | Yes | ||
| General Time | This is the base company for General Time Instruments Corp. and General Time Corp. | General Time Corporation; General Time Instruments Corporation | Yes |
