If a chemical element A is more electropositive than another element B, it attracts less electron than B. In other words the latter element is more electronegative.
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... extent by the slipping friction.
The device is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US patent 5,800,311 (1998) by ...