WASHINGTON, June 7 - Newly disclosed lobbying records and other documents show that the chairman of the House ethics committee, Doc Hastings, a Washington State Republican, has had a close relationship for years with lobbyists at the Seattle-based law firm that is at the center of ethics accusations involving Tom DeLay, the House majority leader.

The records from the law firm, Preston Gates & Ellis, show that the firm's former star lobbyist, Jack Abramoff, a close friend of Mr. DeLay who is now the focus of a federal corruption investigation, boasted to a client in the mid-1990's that the firm had "excellent" ties to Mr. Hastings. The firm repeatedly billed the client for meetings and telephone conversations between Mr. Abramoff's lobbying team and Mr. Hastings's staff.

The records do not show any direct contact between Mr. Hastings and Mr. Abramoff; the contacts were always with others in Mr. Abramoff's lobbying operation. The billing records, which were obtained by The New York Times from the Northern Marianas government, do not show that Mr. Hastings introduced any legislation or cast any vote requested by Preston Gates.

But they do show that Preston Gates pressed Mr. Hastings and his staff several years ago for help on behalf of Mr. Abramoff's most important lobbying client at the time, the government of the Northern Mariana Islands, a small American commonwealth in the Pacific, in blocking the imposition of the federal minimum wage on the islands' clothing factories; human rights groups have long described the factories as sweatshops.