1851 Great Exhibition: Official Catalogue: Class X.: Charles MacMahon
From Graces Guide
601d. MACMAHON, CHARLES, Upper Camden Street, Dublin — Inventor.
1. The jaw-lever, a newly-invented instrument for keeping open the mouth of the horse, ox, dog, or any other animal whilst administering medicine or performing an operation. The advantages are simplicity, without injury to the animal's mouth, and protection to the operator.
2. A temporary horse-shoe, to fasten on without nails; useful where a foot is unsound, or where it may be necessary to remove the shoe frequently.
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