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'''CPC category B64C25/60''' is a category for patents about technologies of oleo struts or legs. This classification covers the same domain as IPC category IPC B64C25/60 as far as we know.
Oleo struts (or "oleo legs") are telescopic shock absorbers on the legs connecting landing wheels to aircraft undercarriages. They have pistons with air and oil flowing between chambers to absorb shocks. Oleo refers to oil.<ref>[[w:Oleo strut]]</ref><ref>https://en.wikipedia.org/wiki/Talk:Royal_Aircraft_Factory_F.E.2#Oleo_struts</ref>
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