| 1925 | Globe-Union acquires Central Radio Laboratories | |
| 1939 | First appearance of the CRL 1452 in a catalog |  |
| Inscription on back is "1452" or "CRL 1452" |  | |
| 1940 | "Low Capacity Lever Action" Catalog Page |  |
| 1944 | First known engineering drawing |  |
| 1944 | "Lever Action Switches" Catalog Page |  |
| 1950 | "Lever Action Switches" Catalog Page |  |
| 1951 | "Technical Bulletin Lever Switch 1452 Series" |  |
| 1953 | "Lever Action Switches" Catalog Page |  |
| 1954 | Redrawn Engineering Drawing |  |
| 1962 | Half Moon Redesign |  |
| 1966 | "Lever Action Switches" Catalog Page |  |
| 1967 | "Series 222 Lever Switches" Catalog Page | 
|
| 1979 | "Centralab Lever Switches" Catalog Page | 
|
| 1981 | North American Philips buys the CRL product line Inscription on back is changed to "1452" or "CRL 1452" plus two inverse alpha characters |  |
| 1983 | "Centralab Lever Switches" Catalog Page |  |
| 1988 | "Mepco/Centralab Lever Switches" Catalog Page | 
|
| 1992 | Electroswitch acquires the rights to manufacture the CRL 1452 (and the rest of the CRL product line) in Raleigh, North Carolina |  |
| 1992-93 | Inscription on back is 'ELEC 1452' |  |
| 1994 | Stator material changed from phenolic (brown) to glass epoxy (white). Part number changed to E2G0203S |  |
| 1994-95 | 'ES 1452' and 'E2G0203S' inscribed on back. No inscriptions after 1995. |  |
| 1996 | Solder tab stagger reversed. 1994-95 (not pictured) had the original stagger with glass epoxy stator. |  |
| 1996 | Stator changed -- extra holes replaced with notches |  |
| 1996 | "E2 Series Lever Action" Catalog Page |  |
