SACHSENHAUSEN, command KLINKERWERK, Prisoner folded letter with statement from the camp rules from Oranienburg 29.3.42 to Teschen, the sender with addition "Kl" for command Klinkerwerk, a satellite camp in the approximate lain Großziegelwerk with high wastage at Persons, censorship single circle postmark "postal service censorship place E / K. L. "