| Hardness Testing - Rockwell |
1944 |
U S Office Of Education |
18 min |
16mm |
B&W |
sound |
| INSPECTION OF PLUMBING AND PIPING |
1944 |
Castle Films |
17 min |
16mm |
|
Sound |
| INSPECTION OF THREADS |
1944 |
Office of Education (Department of Health, Education, and Welfare) |
22 min |
16mm |
B&W |
Optical sound |