1. RIDL Model 34-12 Transistorized 400-Channel Pulse Height Analyzer,1962
2. RIDL Model 52-24 Parallel-to-Serial Converter,1961
3. Automatic Recording and Reading of Digital Data Using IBM Summary Punches,1954
4. General Information Manual, 526 Printing Summary Punch,1958
5. Also useful is: Wiring Diagram, 526 Printing Summary Punch (IBM Drawing, 315911F).