The story
Seen from above, the machine's action might resemble that of a zip fastener.
Etymology from Wiktionary, CC BY-SA 4.0.
zipper machine
Today it means: A heavy vehicle used to transfer concrete lane dividers on a roadway. Full definition →
Today it means: A heavy vehicle used to transfer concrete lane dividers on a roadway. Full definition →
Seen from above, the machine's action might resemble that of a zip fastener.
Etymology from Wiktionary, CC BY-SA 4.0.