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Schematic Symbols Chart | Wiring Diargram Schematic Symbols from April 1955 Popular Electronics ... Electrical Symbols, Electrical Wiring Diagram, Electrical Work, Electrical Projects, Electrical Installation, Electrical Layout, Electronics Projects, Diy Electronics, Electronics Components
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Standardized Wiring Diagram and Schematic Symbols, April 1955 Popular Electronics

There are some variations like whether or not to draw a circle around a transistor or how many lightning bolt lines to use with photon emitters and detectors, but that's about it.

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