4. Internal-combustion engines
  5. Means to whirl fluid before, upon, or after entry into...
  6. Structural projection on working piston causes whirling

Ronald M. Otto

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Combustion chamber for reverse tumble spark ignition direct...

Internal-combustion engines – Means to whirl fluid before – upon – or after entry into... – Structural projection on working piston causes whirling
Reexamination Certificate

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Method and apparatus for operating a spark-ignited direct...

Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate

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