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54<br />
"o Min. wanddikto<br />
fi<br />
L = 100 em<br />
b v k g<br />
15 3 3 3 11<br />
20 3,5 4 3,5 16<br />
25 4 5 4 20<br />
30 4,5 6 4,5 23<br />
40 5,5 7 5,5 30<br />
50 7 9 6,5 35<br />
60 8 10 8 40<br />
70 9,5 11 9 50<br />
Ronde betonbuis<br />
a