Catalogue description films rel to work on light bulb manufacture and sound on film

Details of IET/SPE/3/6/55-56

Reference:	IET/SPE/3/6/55-56
Description:	films rel to work on light bulb manufacture and sound on film
Date:	1920-1940
Held by:	Institution of Engineering and Technology (IET) Archives, not available at The National Archives
Other reference:	See Annual Return 2013

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