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US Patent: 860,132
Signal-drop
Patentee: Henry J. Heeney (exact or similar names) - Boston, MA USPTO Classifications: 340/815.92 Tool Categories: Assignees: Holtzer-Cabot Electric Co. - Brookline, MA Manufacturer: Holtzer-Cabot Electric Co. - Brookline, MA Witnesses: H. J. Livermore W. E. Coveney	Patent Dates: Applied: Sep. 17, 1906 Granted: Jul. 16, 1907 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Holtzer-Cabot Electric Co.
Description: "The present invention relates to a signal drop of the kind commonly used in connection with telephone switch boards..."

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