Orbital Sciences Corp. of Fairfax was awarded a contract by the Defense Advanced Research Projects Agency to provide another Pegasus space launch vehicle. The order, valued at about $7 million, is the fourth option exercised by the agency to buy a Pegasus launch vehicle.

The original contract was for one Pegasus launch vehicle and options to provide five more vehicles.

The first launch of the Pegasus rocket was in April. The launch had been postponed after a Wall Street Journal report raised doubts about the company's viability. The agency ordered its second, third and fourth rockets from April to June.

The total value of the original contract and the options exercised so far is about $35 million, according to a company spokesman.

Fair Lanes Inc. of Baltimore has agreed to buy 1,000 automatic scoring machines from AMF Bowling Inc. of Richmond, AMF officials said.

The order was the largest one-time purchase of automatic scoring machines from the company, said Bob Chiles, AMF Automatic Scoring Division general manager. The scorers will be installed in 53 of Fair Lanes's bowling centers nationwide. Installation of the units is expected to be completed by March.

Virginia's Center for Innovative Technology of Herndon, completed a series of licensing agreements to market Microcel, a device developed at Virginia Tech that cleans coal and upgrades ores and industrial minerals.

The center said that these agreements are a major step in the commercialization of this "clean coal" technology, which Virginia Tech has been pursuing for 10 years with funding from the U.S. Department of Energy's Fossil Energy Program.

ERC Environmental and Energy Services Co. Inc. acquired the water resources contracts and the employees of the Water Resources Group of Sutton-Kennerly & Associates of Greensboro, N.C. The purchase price was about $150,000, the company said.

Pioneer Financial Corp. of Chester, Va., a savings and loan holding company, completed the repurchase of 5 percent, or 153,000 shares, of its common stock. Since June of 1988, the company has repurchased or redeemed 37 percent of its outstanding stock.

Scientex Corp. of Washington was awarded a $500,000 contract to provide information-processing services for American Telephone and Telephone Co.'s FTS2000 custom network project, which will replace the intercity part of the 25 year old federal telecommunications system.

Soft Vac Corp. of Washington, which designs and manufacturers padded vacuum cleaner covers, entered an agreement with Pinkerton Inc. of Van Nuys, Calif. to investigate possible patent infringements nationally.

USTravel Systems Inc. of Washington acquired the Orlando, Fla., branch of N.E.W.S. Travel for an undisclosed amount. The company also announced that its office in Hartford, Conn., was awarded a General Services Administration contract for Connecticut and western Massachusetts.

Lanman Dominion, the Richmond-based subsidiary of the Lanman Companies of Washington, opened an expanded and renovated facility in Richmond for its color separations, printing and graphic services.

International Telesystems Corp. of Herndon created a division to integrate call-management systems into business operations.

Kamber Group of Washington began offering a 900-prefix telephone marketing service for use by trade associations, corporations, labor unions and public interest groups.

Videoworks Inc., a video production company that specializes in professional training videos, opened in Chantilly.

Kemp Mill Records of Beltsville changed its name to Kemp Mill Music. 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.