Summary

Joseph McKenna Detroit Citizens' St. Railway Company v…

Easements in the public streets for a limited time are different, and have different consequences, from those given in perpetuity. Those reserved from monopoly are different, and have different consequences, from those fixed in monopoly. Consequently those given in perpetuity and in monopoly must have, for their authority, explicit permission, or, if inferred from other powers, it is not enough that the authority is convenient to them, but it must be indispensable to them.
Source: Wikisource

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