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Archimedes' screw

The water screw, popularly known as the Archimedes' screw and also known as the screw pump, Archimedean screw, or Egyptian screw,[1] is a machine used for transferring water from a low-lying body of water into irrigation ditches. Water is…

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2525
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139
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5

COVID-19 Emergency mask with the use of cotton pads as a filter

This mask provides a valve for inhalation and exhalation that allows you not to accumulate moisture in the mask . I designed 2 mask sizes Adult/male and child/female. For printing, you will need Flex plastics, the best fit is TPU You can…

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801
Polubienia
92
Ocena
4

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