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(11) | EP 0 124 024 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Hydraulic circuit for self-undecking crane |
(57) A hydraulic circuit for a self-undecking crane having a separable upper and retractable
legs with extendable jacks for elevating the upper, said circuit comprising first
means to raise and lower said legs, second means to extend and retract said jacks,
and third means responsive to the extension of said jacks to render said first means
inoperative. |