At the same time, it is possible to use materials such as silver or copper for the squirrel cage rods and squirrel cage rings, which materials are more favorable as far as the conductivity is concerned, and this is done in such a way that {HEAD ~ no undesirably high contact resistances} between {TAIL ~ the squirrel cage rods} and squirrel cage rings occur 
between
At the same time , it is possible to use materials such as silver or copper for the squirrel cage rods and squirrel cage rings , which materials are more favorable as far as the conductivity is concerned , and this is done in such a way that { HEAD ~ no undesirably high contact resistances } between { TAIL ~ the squirrel cage rods } and squirrel cage rings occur
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