Wooden subframes

made from dry fir wood, lime or pine-tree

batten thickness
21x41 mm DP/21          
  23x63 mm DP/23  
  32x65 mm DP/32 (multi-layered)
  41x65 mm DP/41/32/D (multi-layered)
  65x45 mm DP/45/3D (multi-layered)

standard lengths; 27,30,33,35,38,41,50,55,60,65,70,73,81,

85,90,100,116,120,130,140,150...  
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