Dates for some equipment:
BOLD Canisters, 1942 onwards (no data on dates of upgrades)
FuMO 29 Radar, 1941
FuMO 30 Radar, late 1942, fitted to all boats (0 Renown cost)
FuMO 61 Radar, 1943
FuMO 65 Radar, irrelevant, only fitted to Type XXI's
FuMB 1 Metox Radar Detector, August 1942
KDB Hydrophone, late 1939
Balkongerät Hydrophone, late 1943
3.7 cm Flak gun, 1941
First Alberich Coating, April 1940
Improved Alberich Coating, late 1944
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