专利名称：BALANCER发明人：ALVIN J. KARRELS申请号：US3659463D申请日：19671226公开号：US3659463A公开日：19720502
摘要：A balancer for balancing lawn mower blades having a frustro-conical bladereceiver on which the opening in a blade is placed, magnetic means surrounding thereceiver for holding the blade on the receiver.
申请人：ALVIN J. KARRELS
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