PARKER & PARSLEY DEVELOPMENT LIMITED PARTNERSHIP

PARKER & PARSLEY PETROLEUM USA, INC.

PARKER & PARSLEY PRODUCING LIMITED PARTNERSHIP

PARKER & PARSLEY, INC.

Parker Services, L.L.C

Parker Stevens Agency, L.L.C

PARKER, SMITH & FEEK, INC.

Parker-Hannifin Corporation

PARKWAY CONSTRUCTION & ASSOCIATES, INC.

PARKWAY CONSTRUCTION & ASSOCIATES, LIMITED PARTNERSHIP

Parkway Construction Company

Parkway Holding Limited Partnership

Parkway Mortgage, Inc

Parkwood Drive Limited Partnership

Parkwood Investments I, L.L.C

Parliament Securities Corp

Paro Services Corp

Parom, L.L.C

Parr Emergency Products Sales, Inc

Parsons Brinckerhoff Construction Services, Inc. (de)