GB 122

GB 122 refers to Class 122 within the British Abridgment of patent specifications: "Steam Engines, [including details common to fluid-pressure engines generally]."

There is at least one explicitly aeronautical subclassification within GB 122.

• GB 122 aero steam engines (see for 1889–1992, listing Patent GB-1889-10359, Patent GB-1889-16883, and Patent GB-1891-19228)

Links by years covered:

• 1877–83
• 1884–88
• 1889–92

Enclosing categories	British patent classifications
Subcategories	GB 122 aero steam engines
Keywords	Engine, Steam, Propulsion
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