LEGO Pneumatic: Back in sets?
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Pneumatic sets have been part of the LEGO Technic theme for a long time, with the first sets being introduced in 1984, just two years after the Technic name was introduced. However, there haven't been many pneumatic sets released: if you exclude re-releases, accessory packs and LEGO Education, only 28 sets have been released in 39 years, with a 29th (42157 John Deere 948L II Skidder) not announced until later this year. Despite this rarity, pneumatic sets remain popular