|Name:||Dario - Impex Electrical Ltd. (see also Dario France); London (GB)|
|Products:||Model types Tube wholesaler|
Impex Electrical Ltd.
Impex Electrical Ltd. was not a manufacturer, but a wholesaler who sold tubes bearing the Dario brand. Additionally, Impex held the rights to the name Dario (registered Trade Mark) in Great Britain.
 claims that such tubes were imported from N.V. Philips in the Netherlands, but in "History of the British Radio Valve to 1940" K.R. Thrower writes: "Dario-Impex (UK): Selling Philips tubes of French production". Tubes were acquired and imported from the Frech La Radiotechnique. 
Dario-Impex was also used in official literature to distinguish tubes from the french La Radiotechnique, who held the Dario brand in France (Dario-RT).
There are also a few Dario radios known - most likely also imports.
Impex Electrical Ltd. obtained registration of Trade Mark in classes 8 (appartus for use in wireless telephony and telegraphy) and 13 (electrical goods) for the word "Dario" under the numbers 469519 and 469520 on the 30th of April 1926. 
Impex commenced an infringement action against Philip Weinbaum who tried to sell Dario tubes under circumvention of Impex. Weinbaum argued that the registration of a foreign Trade Mark for goods that the registrar does not produce himself is not valid. The court upheld the validity of the registration. 
 Monopolies Commission report on the supply of valves [...], 1948
|GB||28||Battery receiver SG3||Reduced price of £ 5/17/6 in ca. 1929.|
|GB||29||Regional Straight 3||Dario Regional Straight 3, housed in oak cabinet, complete with valves and matched spea...|
Further details for this radio manufacturer by the members (rmfiorg):