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Best, G. M. Improvements in the All-Purpose Tube (R) SP7-24* Blake, Alan. Dating Philips Tubes After 1948 2-3-13@ European Standard Receiving-Tube Nomenclat- ure 2-2-9@ The Sargrove UA55 All-Stage Tube 8-5-10@ Tube-Heater Flash - Some Retrospective Thoughts 4-3-9* Bolack, Tommy. Bigger Than Average 4-6-15. Bondy, M, and Bruce, W. A. RCA Fixes ... ................
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