| 摘要 |
In a pump (9, 9') which delivers viscous construction materials from a hopper (4) to a supply line (12), the liquefacient is admixed to the construction material by means of a pump (1) which is driven by a hydromotor (5) which has flowing through it the hydraulic oil drawn from the drive cylinders (8, 8') of the delivery pumps (9, 9'). <IMAGE>
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