Swedish Eskilstuna Stal Pressing AB steel mill was chosen as the contractor and a Polish commission spent several weeks observing the Swedish technology.
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The Border Guards and State Police were provided with a variant of the wz.31 helmet with a large (10 centimetres in diameter) White Eagle adorning the forehead.
The Polish then produced a licensed copy as the wz.31 model (Polish: Moździerz piechoty 81 mm wz. 31) starting in 1935; 1,050 were made in Pruszków.