Pickett 520-T Air Force Aerial Photo Rule Type A-1

---

Country of manufacture: USA,            Date of manufacture: ____
Overall length: 30.9 cm,          Width: 3.8 cm,           Weight: 97.4 gms
Materials: all aluminum, adjustable
Cursor: 2.9 X 5.0 X 0.8 cms; all plastic, slightly magnifying, adjustable; lines = single line front and back
Scales: 16, including some specialized on back
Front: L, A, DF [ CF, CIF, T, S, C ] D DI, K
Back: Ground size, Ground Speed [ Image Size (cm), Image Size (feet), Focal Length ] Altitude
Gauge Marks: [ π, R ]
Condition: C2-C3 (Mint to very minimal signs of use)
Came with: Original orange leather case w/plastic insert marked, "U. S. Air Force/Aerial Photo/Slide Rule/Type A-1"

---

Equivalents Table sewn into leather case

---