Home›Browse›separate system🌐EnglishEnglishFrançaisPolskiSvenskaTürkçe中文日本語EntityQ7451795· pop 5· linked from 50 articlesseparate systemSign in to saveAlso known as Philadelphia system, Pennsylvania systemprison systemAvailable in 5 languagesFrançaisPolskiSvenskaTürkçevia Wikidata sitelinks · CC0