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Universal Power Drives Ltd, Aintree Road, Perivale, Greenford, Middlesex.

4-wheel drive tractors with Perkins or Gardner diesel engines designed mainly for forestry work although some found work as dockside tugs.

Unipower acquired Haulamatic-Heathfield and was in turn acquired by the Alvis Car & Engineering Co Ltd. Alvis sold Heathfield in 1998.

1956 Alvis Mk 6 Salamander 23AG56

1956 Alvis Mk 6 Salamander 23AG56

1956 Alvis Mk 6 Salamander 23AG76

1956 Alvis Mk 6 Salamander 23AG76

Alvis Mk 6 Salamander 73AG90

Alvis Mk 6 Salamander 73AG90

1956 Alvis Saracen XFO184

1956 Alvis Saracen XFO184

1956 Alvis Saracen XFO184

1956 Alvis Saracen XFO184

Alvis Stalwart XFF265

Alvis Stalwart XFF265

1967 Alvis Stalwart 728UXK

1967 Alvis Stalwart 728UXK

1962 Alvis Stalwart 983UXU

1962 Alvis Stalwart 983UXU

1965 Alvis Stalwart DCK180C

1965 Alvis Stalwart DCK180C

1965 Alvis Stalwart DCK180C

1965 Alvis Stalwart DCK180C

1969 Alvis Stalwart RCD233G

1969 Alvis Stalwart RCD233G

1970 Alvis Stalwart ANM306H

1970 Alvis Stalwart ANM306H

1971 Alvis Stalwart GVG382K

1971 Alvis Stalwart GVG382K

Alvis Stalwart 23EK97

Alvis Stalwart 23EK97

alvis_stalwartqm_ps_1

alvis_stalwartqm_ps_1

alvis_stalwartqm_ps_2

alvis_stalwartqm_ps_2

1996 Tactica APV H19OAA

1996 Tactica APV H19OAA

Haulamatic 72KB79

Haulamatic 72KB79

Haulamatic

Haulamatic

Haulamatic

Haulamatic