| Source: Abbco News, 1949 (incomplete run) Location: IL / 338.7 / Ab123 | |
 | |
| Last Name: | Rittenhouse |
| First Name: | Ralph |
| Middle Name: | H. |
| Volume: | 9 |
| Issue: | 8 |
| Date of Publication: | September 2, 1949 |
| Page: | 23-24 |
| Remarks: | in list of employees celebrating birthdays; only name is given |
