Assertion: flat iron | /r/CapableOf | go into the mouth
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Source sentences:
text: His essay entitled, "The Method of Procuring Slaves on the Coast of Africa; with an account of their sufferings on the voyage, and cruel treatment in the West Indies", describes the iron bit as having "a flat iron which goes into the mouth, and so effectually keeps down the tongue, that nothing can be swallowed, not even the saliva, a passage for which is made through holes in the mouth-plate.