KPMG Peat Marwick Letterhead Exhibit 23.1 CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS The Board of Directors Advanced Tehcnology Laboratories, Inc.: We consent to the use of our reports incorporated herein by reference. Our report refers to a change in the method of accounting for investments by adopting Statement of Financial Accounting Standards No. 115, Accounting for Certain Investments in Debt and Equity Securities. KPMG Peat Marwick LLP Seattle, Washington August 8, 1995 Page 14