|
| PD 51 Horizontal (normal) ... 1936 |
| PD 52 Horizontal (normal) ... 1936 |
| PD 53 Horizontal (normal) ... 1936 |
| Cf. XLV-31 Horizontal (normal) ... 4 Aug 1950 |
| W.B. Dinsmoor, Jr ... f Fragile Drafting Film Drafting Ink
Pencil ... 1973 |
| John Travlos ... Dirty Cartridge Paper Drafting Ink ... 1936 |
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