⟩ Who invented springs?
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What are examples of mechanisms?
What is the strongest pistol in the world?
How many BTU per Hour equals 1 Ton of Air Conditioning?
How is a submarine able to submerge and surface?
What is railroad track ballast?
What are the advantages of powder metallurgy?
Who built the Trans Alaska pipelene?
Is pipe round because it provides the least area to volume ratio?
What does Green field project mean?
What are some examples of a periscope?