Injection moulding machines and mechanical aggregates therefor, namely, locking devices in the nature of toggle lever drives, hydraulic cylinder drives and spindle drives, shaping devices in the nature of injection moulds and mould cavities, plasticizing devices in the nature of heated barrels, and injection devices in the nature of plasticizing screws for injection moulding machines, non-return valves being parts of machines, electric drives for machines and control hydraulics for machines a...