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In page De Havilland Mosquito:

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Ninety-seven NF Mk.IIs were upgraded with 3.3 GHz frequency, low-SHF-band AI Mk.VIII radar and these were designated NF Mk.XII. The NF Mk.XIII, of which 270 were built, was the production equivalent of the Mk.XII conversions. These "centimetric" radar sets were mounted in a solid "thimble" (Mk.XII / XIII) or universal "bull nose" (Mk.XVII / XIX) radome, which required the machine guns to be dispensed with.[citation needed]