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Music-Indicator.
Patent for a device that is set upon a piano or other keyed instrument to indicate keys and chords, with illustrations.
Date:
January 21, 1908
Creator:
Hobart, Frederick Earl
System:
The Portal to Texas History
Music-Indicator.
Patent for a music indicator, which shows sheet music notations and the name of the note and major and minor chords on a device, which is placed over the keyboard of a piano to show where the different notes are for use in teaching music.
Date:
January 21, 1908
Creator:
Thrash, William E.
System:
The Portal to Texas History
Spring Hinge
Patent for providing a "door-hinge of simple and durable construction swinging freely either way from a spring which is fast at one end, but adapted at the other to ride freely up and down the doorjamb" (lines 9-12) including an illustration.
Date:
January 21, 1902
Creator:
Kincaid, Michael A. D.
System:
The Portal to Texas History