EntityQ7391581· pop 6· linked from 56 articlesSM U-4Sign in to saveAustro-Hungarian Navy's U-3-class submarineWikidata factsInstance ofsubmarineOperatorAustro-Hungarian NavyCountry of originGerman ReichManufacturerFriedrich Krupp GermaniawerftImageSM Unterseeboot Nr. IV.jpgShow 3 more factsP1071KielP1889SM U-4P793keel layingvia Wikidata · CC0On the mapConnectionsgross register tonnageEntityImperial German NavyEntityCategories1908 shipsShips built in KielU-3-class submarinesU-boats commissioned in 1909World War I submarines of Austria-Hungary