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专利名称：TEACHING AID发明人：DIMOND H,US申请号：US3721151D申请日：19710719公开号：US3721151A公开日：19730320
摘要：A teaching aid for use in combination with brass instruments composed of a rim,a tapered shank and one or more arms, each of which is securedly attached at one end tosaid rim and the other end thereof to the larger end of said tapered shank. In a preferredembodiment the tapered shank is provided with an opening extending longitudinallytherethrough.
申请人：DIMOND H,US
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