One of the mysteries of the English language finally explained.
1Manufacturing Technology. A machine for forming the heads on various small metal parts, especially on fastenings such as nails and rivets.
2Agriculture= "header". Now historical.
3Mining. A machine used to drive horizontal tunnels.
Late 18th century; earliest use found in Thomas Jefferson (1743–1826), revolutionary politician and president of the United States of America. From heading + machine.
heading machine/ˈhɛdɪŋ məˌʃiːn/
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