SACHSENHAUSEN, Kommando KLINKERWERK, prisoner's folded letter with excerpt from the camp regulations from Oranienburg 29. 3. 42 to Teschen, the sender with the addition "Kl" for Kommando Klinkerwerk, an external camp in the nearby Grossziegelwerk with a high rate of attrition among people, censorship single-circle stamp "Postzensurstelle E / K.L... "