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	1.	Amplifiers and heterodynes ... Prepared in the Office of the chief signal officer, December, 1921. by United States. Army. Signal Corps Series: Radio communication pamphlet ; no. 9 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington, Govt. Print. Off., 1922 Other title: Heterodynes, Amplifiers and Availability: No items available. Add to cart (remove)
	2.	Introduction to line radio communication ... prepared for the Office of the chief signal officer, January, 1923. by United States. Army. Signal Corps United States. National Bureau of Standards Series: Radio communication pamphlet ; no. 41 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington, Govt. Print. Off., 1923 Availability: No items available. Add to cart (remove)

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