Miscellaneous notes from Charles H. Kaman - Research & Development Notes - Changes and Observations Log

This document is an internal Ovation guitar research and development log dated 8/11/77, cataloging construction changes and acoustic measurements across multiple guitar prototypes or production units. It details modifications such as fan configurations, brace adjustments, bridge changes, and hole dimensions, along with their effects on sound quality including bass, mid-range, and treble characteristics. The notes include dated entries spanning from late 1974 through mid-1977, tracking the acoustic properties and structural alterations of various numbered guitar specimens.