Poreh and Dtmant 
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a. 
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& 0.416 ID 
OM OLIT MO 
Fig. 9 Measurements of friction coefficients. 
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a 
= 
oO 
wn 
AP-30 
® 0.18 ID 
® 1.624 ID 
Dooo0000w 
Dam owsion 
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EG AG)) 
Fig. 10 Measurements of friction coefficients. 
L sae 
