This serial number data is from the Serial Number Reference Book for Metalworking Machinery (1959 edition).
1. Bath Equipment Serial Numbers represent the first year of issue (i.e.) 1939 for example S-391).
2. The first two digits following the prefix letter(s), indicates the year in which the machine was built except for the years 1950, 1951, 1952 & 1953, which are represented by the digits 05, 15, 25 & 35, respectively.
3. The prefix Letters for the type of equipment are as follows:
| Prefix Letter. | Type of Machinee |
| S | Power Press Brakes |
| PT | Press Type Brakes |
| CB | Contour Benders & Contour Formers |
| SF | Stretch Formers |
| SP | Stretch Press Machines, Special Brakes & Special Machines of all kinds |
| TB | Tangent Benders |
| TRA | Traversing Right-Angle Power Units |
| SS | Skin Stretchers |
Information Sources
- Serial Number Reference Book for Metalworking Machinery, by the Industrial Publishing Corp., 1959