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Tube Substitutions for:
1904
Current Regulator, Iron in Hydrogen

Type	Substitutes	Base Diagram
1904
Web References	1904 (Philips) @ Franks Electron Tubes? 1904 (Philips) @ Franks Electron Tubes? 1904 (Philips) @ Franks Electron Tubes? 1904 @ Radiomuseum

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