Patent for "a guard for key-holes of locks, to prevent the use of keys by unauthorized persons, the picking of the lock, and as a means for operating the bolt when fitted for that purpose." (Lines 7-11) Includes instructions and illustrations.
Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.
Descriptive information to help identify this patent.
Follow the links below to find similar items on the Portal.
Titles
Main Title:
Improvement in Key-Hole Guards.
Added Title:
Key-Hole Guards.
Description
Patent for "a guard for key-holes of locks, to prevent the use of keys by unauthorized persons, the picking of the lock, and as a means for operating the bolt when fitted for that purpose." (Lines 7-11) Includes instructions and illustrations.
Physical Description
[1], 2 p. : ill. ; 23 cm.
Notes
Specification forming part of Letters Patent No. 145,865, dated December 23, 1873; application filed June 2, 1873.
Hall, William N.Improvement in Key-Hole Guards.,
patent,
December 23, 1873;
[Washington D.C.].
(https://texashistory.unt.edu/ark:/67531/metapth166917/:
accessed April 26, 2024),
University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu;
crediting UNT Libraries Government Documents Department.