Bread Overhead! by Fritz Leiber:
Science Fiction Inventions, Technology and Ideas
Humorous story explores what happens when corporations manufacture bread using hydrogen and helium as rising agents; a failure to use heavy metal bags resulted in millions of loaves taking flight.
(Walking Mill from Bread Overhead!)
The ultimate combine - giant metal centipede walks through fields, harvesting wheat, threshing, grinding and finally baking bread right in the field.
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