CAMPBELL, Chief Judge.
Defendants in a motion to suppress have placed in issue here a telephone company "pen register" system, by alleging that in the investigation and detection of the crime charged in this case, use of such a pen register constituted a violation of § 605 of the Federal Communications Act (Title 47, U.S.C.).
The facts related to this issue are for the most part uncontroverted.
The pen register is a mechanical device attached...
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