ケンタッキー・エレクトリカル・ランプ・カンパニー
1 2 Kleber, John, ed (1992). The Kentucky Encyclopedia. University Press of Kentucky. pp. 487. ISBN 9780813117720. https://books.google.com/books?id=8eFSK4o--M0C&pg=PA487
↑ “MPD Components, Inc. Manufacturer of Ceramics, Ceramic Seals, Vacuum Electron Devices (VEDs) like Planars, Magnetrons and Spark Gaps, and RF Microwave Circuit Modules (MCMs)”. www.mpdcomponents.com. 2016年2月21日閲覧。