Netrix Corp. of Herndon was awarded a subcontract by Martin Marietta Data Systems to supply a switching system network to the Department of Housing and Urban Development. Martin Marietta was awarded the $526 million contract to provide HUD with a new computer system and data communications network.

The Netrix network will allow incompatible systems at HUD to work together and will be the first step in installing the entire system, said Martin Marietta vice president Peter Bracken in a statement.

Netrix, which produces specialized networking systems, said the contract for installation of its equipment in 1991 is worth $2 million to $3 million, but added there is a possibility the network will be expanded in the future.

Disclosure Inc. of Bethesda, a provider of public company information, entered a joint venture with Wright Investors' Service of Bridgeport, Conn., to market Worldscope, a database Wright developed that contains information on 5,500 public companies in 25 countries.

Disclosure, which claims to be the largest single-source provider of domestic and international public company information, will offer Worldscope through on-line information systems, CD-ROM discs, magnetic tape lease and published periodicals.

Hadley & House of Bethesda and the Law Offices of H. Mark Rabin of Rockville merged their practices. The new firm, Hadley, House & Rabin, is in Bethesda.

Dexel Systems Corp. of Vienna and International Business Machines Corp. entered a cooperative software marketing agreement that authorizes IBM to market Dexel's Collections Management System.

Burnham Service Corp. of Columbus, Ga., a national transportation, distribution and warehousing firm, opened a 180,000 square-foot terminal facility in Upper Marlboro. The 180,000 square foot terminal has 35 weatherproof cargo bays, materials-handling equipment and administrative offices.

Rubino & McGeehin CPAs consolidated its Bethesda and Washington offices into one office in Bethesda.

Geofinance Ltd., which specializes in the trading of Latin American debt instruments, opened in Washington.

National Electronic Warranty Corp. moved its headquarters to Sterling from Arlington.

Electricite de France International opened a North American representative office in Washington.

Parkhurst, Wendel & Rossi, a law firm specializing in patent, trademark and copyright law, opened in Alexandria.

Hager Associates, an international finance and trade consulting firm, opened in Washington.

Secure Flight International, an aviation security firm, opened in Washington.

The accounting firm Lanigan, Ryan, Malcolm, McGivern and Cox opened an office in Rockville.

American Wild Bird Co. of Rockville opened a new store in Frederick.

Duke Engineering & Services Inc. of Charlotte, N.C., opened a Washington office.

Ken Murphy and Associates of Vienna, a new homes sales and marketing firm, formed a consulting division.

The Washington Consulting Group of Washington introduced a Center for Technology that will feature lectures and presentations of working papers on innovation and technology.

Madeline, a women's clothing and accessories store, opened in Bethesda.

Associated Information Managers of Gaithersburg changed its name to the Association for Information Management to reflect its new focus on the management of information within and between organizations.

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.