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In page Snow pusher:
"Although snow pushers did not become widely used until the 1980s, they have been around since the 1970s. Initially, they were not produced by manufacturers, but they were recognized as a good idea by snow removal professionals who either welded their own or contracted to have them fabricated. For a long time, the most common snow pusher design was to take a septic tank or other large steel cylinder and cut it in half, then build a mounting system on the back to attach it to a machine. This type of bare bones construction lasted until the 1990s when various manufacturers began producing them commercially.
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