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- manual washing machine
- Mary Woll - stonecraft Shelley, author of Frankenstein
- massage and physical-manipulation therapy developed by F Mathias Alexander
- measure of chilies’ hotness by how much sugar water is required to neutralize heat; invented by Wilbur Scoville
- mechanical television
- metronome
- Michael Faraday (disk), Hippolyte Pixii (coil)
- Michael Faraday (disk), Hippolyte Pixii (coil)
- Michael Faraday (disk), Hippolyte Pixii (coil)
- Michael Faraday (disk), Hippolyte Pixii (coil)
- microchip
- microphone
- microwave oven
- Mikhail Kalashnikov
- milking machine
- miner’s safety lamp
- modern oilwell
- monotype typesetting
- motion picture camera
- motor scooter
- motorcycle
- movable-type printing
- movie director Preston Sturges
- multiplex theaters
- musculoskeletal-release therapy developed by Tom Bowen of Australia
- music synthesizer
- neon lamp
- newspaper vending machine
- Nicholas Cugnot
- Nikola Testa
- nylon
- O F Winchester
- offset printing
- oil pipeline
- Ole Evinrude
- Orville and Wilbur Wright
- osteopathy
- Ottmar Mergenthaler
- Otto Blathy
- outboard engine
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