Resource Type
Counties
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Telephone Attachment.
Patent for a telephone attachment for multi-party lines, which allows the user to hold the line against eavesdropping by other users on the line and let multiple people use the line at the same time.
Date:
November 23, 1909
Creator:
Mitchell, Charles B.
System:
The Portal to Texas History
Improvement in Car-Couplings.
Patent for an improved automatic car-coupling, including illustrations.
Date:
November 23, 1875
Creator:
Harper, Derastus
System:
The Portal to Texas History