Precision Apparatus Roll Chart Mechanism. The chart, and presumably the mechanism, is applicable to series 910-912-914-915-920-922 & 924. The chart has deteriorated, the description is of the mechanism. Overall appearance is very good. No rust, rotates freely. Approximate size of the frame 9.25?W, 1.25"D, 2.5"H. Item #10820
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John E. Kendall
jkvintel@gmail.com
Vintage Electronics
2416 Watervale Rd
Unit 436
Fallston, MD - 21047