FIELD: making polymeric pipes. SUBSTANCE: frame has at least two spaced layers of a perforated strip. At least one of the strips is provided with pins directed into the space. The width of the space between the layers corresponds to the height of the pins. EFFECT: enhanced reliability. 4 cl, 6 dwg
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|
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|
RU2220353C2 |
| OIL WELL PUMPING UNIT | 1998 |
|
RU2132975C1 |
