RM-51
The RM-51 ( "Raketomet vzor 1951" ) multiple rocket launcher was a Czechoslovak army alternative of the BM-13 multiple rocket launcher developed in the 1950s . 
<triplet> RM-51 <subj> Czechoslovak <obj> country of origin <triplet> BM-13 <subj> multiple rocket launcher <obj> subclass of