Development centre ZJVS in Martin sa since 1958 zaoberalo vývojom explosive odmínovacieho zariadenia (cover názov PRUNA 3).
Source : ŠTAIGL, Jan Zbrojná production in Slovakia in rokoch 1954 – 1960, str. 68, MILITARY HISTÓRIA 2003/1 the military history institute in Bratislava.
Source : ŠTAIGL, Jan Zbrojná production in Slovakia in rokoch 1954 – 1960, str. 68, MILITARY HISTÓRIA 2003/1 the military history institute in Bratislava.