Vintage Neal Feay Cost Reduction Slide Rule Model CR-6 (Log-Linear cumulative average curve) Model LC-6 (Log-linear individual unit curve). Back in the day before PC’s and tablets this aluminum Slide Rule was used in manufacturing to make estimating judgments, measuring performance, analyze vendor bids, projecting build schedules and determining make/buy decisions. It was previously owned by a Manufacturing Engineer who then worked at North American Aviation. NAA was a major American aerospace manufacturer, responsible for a number of historic aircraft, including the T-6 Texan trainer, the P-51 Mustang fighter, the B-25 Mitchell bomber.

Specifications: NEW LOWER PRICE

Country of manufacture: USA, Goleta, CA  Date of manufacture: 1953
Overall length: 17.2 cm,          Width: 3.8 cm,           Weight: 28.0 gms.
Materials: all aluminum. With adjustable acrylic cursor/inner aluminum scale.
Cursor: 2.2 X 4.5 X 0.5 cms; aluminum runners holding a acrylic cursor lens.
Scales: 18, specialized, linear based on quantities and learning curves
Front: (labeled: Unit Cost) Learning Curves: 95%, 90%, 85%, 83% [ C ] D, Learning Curves: 80%, 78%, 75%
Back: (labeled: Average Cost): Learning Curves: 95%, 90%, 85%, 83% [ C ] D, Learning Curves: 80%, 78%, 75%
Gauge Marks: [π ]
Condition: C2-C3 (Very good with minimal signs of wear - see photos)
Included: leather pocket slipcase and scale with decimal equivalents