🌐EnglishEnglish日本語EntityQ5883257· pop 5· linked from 66 articlesHolman ProjectorSign in to saveA pneumatic or stem powered anti-aircraft developed and used during World War Two.Wikidata factsImageHolman Projector in action.jpgSources (1)en.wikipedia.orgvia Wikidata · CC0Available in 4 languagesFrançais日本語Norwegianvia Wikidata sitelinks · CC0ConnectionsWorld War IIConceptdepth chargeEntityCategoriesAnti-aircraft guns of the United KingdomBritish Merchant NavyGrenade launchers of the United KingdomIngersoll RandMilitary history of CornwallNaval anti-aircraft weaponsPneumatic mortarsWeapons and ammunition introduced in 1940World War II naval weapons of the United Kingdom