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USA: Radio Catalog for the radio manufacturer Electrical Research Laboratories Inc. (Erla); Chicago, Illinois

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Model	Year	Category	Tubes	Pictures			Forum	Coll.Pr.
DuoConcerto C4F [RP]	1929	Radio	8
DuoConcerto C5F [HB]	1929	Radio	8	1
R2 & A2	1929	Radio	8 - 26			1S
Sky Rover 224	1930 ?	Radio	8 - 24			1S
30	1929	Radio	8 - 24			1S		$
31	1929	Radio	8 - 24			1S		$
32	1929	Radio	8 - 24			1S		$
81 Ch= 245	1931/32	Radio	8 - 24A			1S
82 Ch= 245	1930 ?	Radio	8 - 24A			1S
224 AC	1930 ??	Radio	8 - 24			2S
224-B	1930	Radio	8 - 24	1		1S
225	1930	Radio	8 - 24			1S
35 Ch= 230	1930	Radio	9 - 24A			1S
37 Ch= 230	1930	Radio	9 - 24A			1S
38 Ch= 230	1930	Radio	9 - 24A			1S
39 Ch= 230	1930	Radio	9 - 24A			1S
76-AC	1937	Radio	9	4
85 [C 325$]	1928	Radio	9
85 [C 350$]	1928	Radio	9
85 [T]	1928	Radio	9
9100	1935 ?	Radio	9 - 34			3S
R1 & A	1928	Radio	10 - 26			1S
72-AC	1937 ?	Radio	11
Audio Frequency Transformer	1923	Radio part		3				$
Duo Dynamic Speaker	1928	Speaker-P		2
Electric Pickup	1928	Microphone/PU		2
Fixed Crystal Detector	1923	Radio part		2				$
Rheostat	1925	Radio part		1
Selectoformer Type A	1924	Radio part		1				$
Synchronizing RF Transformer Duo-Reflex 1	1923	Radio part		1		1S		$
Walnut Cabinet for Duo Dynamic Speaker	1928	Cabinet		2
Balloon Circloid RF-Transformer	1925	Radio part		7
noname?	1929	Radio
R.F. Transformer AB1, AB2, AB3	1922	Radio part		1				$

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