https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=84554&pn=33,912 Improved Device for Weaning Calves Patentee: John J. Welling - Cedar Falls IA Granted:1861-12-10

Main pieces connected with a central pivot; the spring keeps the two parts clamped in the animal's nostrils. Surviving drawing is incomplete.
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