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ACOUSTICAL LETTER Thin film lenses for surface acoustic waves and their application to filters Yuji Suzuki,* Takayuki Osawa,** and Shigeru Shimizu*** *Faculty of Engineering , Yamanashi University, 4-3-11 Takeda, Kofu, 400 Japan **The Chubu Electric Power Company , Inc. 1 Toushin-cho, Higashi-ku, Nagoya, 461-91 Japan ***NGK Inslators , Ltd. 2-56 Suda-cho, Mizuho-ku, Nagoya, 467 Japan (Received 12 May 1993)

Thin film lenses for surface acoustic waves and their application to filters.