Woodbrook Capital Inc., a private investment firm based in Towson, Md., said it sold chain saw manufacturer McCulloch Corp. to Shop-Vac Corp. for an undisclosed price.

McCulloch, based in Tucson, also makes outdoor power equipment such as hedge trimmers, vacuums and water pumps. Woodbrook has run McCulloch since 1983, when it bought the company from Black & Decker Corp. of Towson.

Woodbrook President Earl Lineham said McCulloch and Shop-Vac, based in Williamsport, Pa., have similar marketing and manufacturing needs and should mesh well.

Westinghouse Electric Corp. of Pittsburgh has acquired Park Air Electronics Ltd. of Market Deeping, England, for an undisclosed amount, and plans to make Park Air a wholly owned subsidiary of the Baltimore-based Westinghouse Electronic Systems Group.

The Baltimore subsidiary provides electronic systems and services for military and civilian applications. Last year the Electronic Systems Group had sales of $2.8 billion.

Park Air produces VHF/UHF radio communications equipment and systems, mainly for the air traffic control market. It exports its products to civil and defense companies and more than 60 airlines in 140 countries.

Bolton Offutt Donovan Inc. of Baltimore, a benefits consulting firm, created an employee communications division through the acquisition of the Gladstone Group, also of Baltimore.

Bolton Offutt Donovan, which has 50 employees and had revenue of $5 million in 1989, will gain the in-house capability to design and produce employee benefit information under the direction of Thomas Rich, who had owned Gladstone. Terms of the acquisition were not disclosed.

Jeffrey W. Harris, chief executive of George F. Harris and Associates of Wheaton, which operates Harris Insurance Service, acquired the company for an undisclosed amount in a partnership with Joseph E. Potter. The new firm, Harris & Potter Insurance Service, will remain based in Wheaton.

Newbridge Networks Inc. of Herndon received a contract for an undisclosed amount to provide an integrated voice and data network to the Greater Manchester Police in Manchester, England.

The Kamber Group of Washington gained the advertising and marketing contract for So Deep Inc. of Manassas Park, which provides information on the location of underground pipelines, power cables, communications and water lines.

National Consulting Strategies of Silver Spring received a contract to represent the National Association of Mortgage Brokers before Congress on proposed changes to the Real Estate Settlement and Procedures Act.

The Pinnacle Design Group Ltd. of Bethesda received design contracts from Winchester Commercial of Calverton, National Capital Insurance Agency Inc. of Washington, Robertson, Pressman & Morris Ltd. of Arlington and Audio Video Surroundings Inc. of Washington.

Systems Technology Forum of Fairfax was awarded a contract by the National Systems Programmers Association of Milwaukee to provide its 23,000 members with technical communications training.

Demaine, Vickers & Associates of Alexandria won the advertising and promotion contract for Springfield Mall.

The city of Rockville joined the I-270 Partnership.

Dorf & Stanton Communications Inc. of New York opened a Washington office.

NCE Group Inc. of Vienna opened a travel subsidiary, Concourse Travel.

Metrospace Inc., a space planning and interior design firm, opened in Washington.

Gordon S. Dunlop opened Dunlop Marketing Services in Washington.

Drug Emporium opened its eighth area store in Alexandria.

Syscom Services Inc. of Kensington introduced a fax broadcasting service that can send a single document to several locations at once.

Announcements of news and developments affecting Washington area companies should be sent to Regional Report, Business News Department, The Washington Post, 1150 15th St. NW, Washington, D.C. 20071. Information must be received the Monday before publication to be considered for inclusion in Washington Business.