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La reconstruccion del HMS London es de 1939
https://www.naval-history.net/xGM-Chrono-06CA-London.htm
Extracte del link que subi
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September Under major refit and reconstruction by HM Dockyard Chatham.
to Work done included with ship under Dockyard Control.
December New design superstructure with aircraft hangars, cranes and catapult forward.
Bridge design modernised.
Funnel arrangements changed and only two used.
Two twin 4in AA mountings and additional smaller AA guns fitted.
Air warning radar Type 279 fitted on both masts.
Fire control radar for forward main armament Type 284 and for 4in mountings Type
285 provided with aerial units on gunnery directors. For details of the development
and in RN see RADAR AT SEA by D Howse).
Armour protection added over machinery spaces.
(Note: The significant increase on displacement after modernisation resulted in
increased structural stresses in a hull which had been designed to met Treaty
limitations. During subsequent service these weaknesses were most likely to
have been the cause of the leakages in fuel and feed water systems during
later service