Along with the cough and murmur of cows and the muffled curses of the herdsman, the hoot of a vacuum tanker pump in full song is part of many dairy farms. Mostly these pumps – pto-powered and often Italian-made – chug on for years, if not decades, slowly shedding non-vital bits and disappearing under a crust of black oil and old slurry.
But there co...
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