During the German invasion of Poland, core Polish Cipher Bureau personnel were evacuated, via Romania, to France where they established the PC Bruno signals intelligence station with French facilities support.
Selama invasi Jerman ke Polandia, petugas Biro Cipher Polandia inti dievakuasi, melalui Romania, ke Prancis di mana mereka mendirikan stasiun sinyal PC Bruno dengan fasilitas pendukung Prancis.