| 0AS-21 | 26303 | GREENE TWEED AND CO ADVANTEC DIV |
| AN6231-21 | 88044 | AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE |
| DRI-21 | 30438 | DELTA MFG AND SALES INC |
| G-21 | 72637 | GAYLE GEORGE W AND SON |
| FWR-3C-21 | 83908 | ACE PRODUCTS CO OF TOLEDO INC |
| AN6231-A21 | 88044 | AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE |
| SRC-21 | 25942 | SCRAPPER RINGS CO DIV OF ROBERTS TOOL CO |
| MIL-S-5049 | 81349 | MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |
| ISR-21 | 95725 | INDUSTRIAL SUPPLIES |
| GI1171-21 | 96679 | GAD-JETS INC |
| MS28776M2-21 | 96906 | MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |