The factory made bombers during WW2. Later it became part of the Dunlop Rubber company. It closed in 1979/1980, in part due to destructive behaviour of the trades unions. It was demolished and the site now houses various industrial units.
It was on Speke Hall Avenue, and the main gate was opposite the junction with Dunlop Road. Speke Hall Avenue now leads to the "new" Liverpool Airport. This airport was named after John Lennon, and what a travesty that is: it's difficult to think of a less deserving deadbeat. Is he really the best example of value and worth that Liverpool has?
Anyway, the factory made car tyres, truck tyres, cycle tubes, golf balls, tennis balls, and conveyor belting.
There was a chap on the old black & white TV programme, What's my line? (Eamon Andrews et al) who claimed to pump the air into tennis balls. No such job existed.
In answer to another's question, Wellington boots were made at the Dunlop Footwear plant in Walton, Liverpool.
The Lockheed factory was Lockheed Hydraulics, not the Lockhead Aircraft company.