The Federal Reporter73. West Publishing Co. 1896. p. 470. Archivado desde el original el 13 de mayo de 2010. Consultado el 21 de abril de 2013. «The Rockwell patent, No. 471,982, for a bicycle bell, consisting of a combination of a base plate, with a revoluble striker bar, spring-actuated in one direction, a lever operatively connected therewith, and adapted to rotate the striker bar in opposition to the force of the spring, and a gong, held invalid because of anticipation by the English patent, No. 2,425, of June 22, 1877, to Alfred Bennett, for improvements in call bells, door bells, etc. 64 Fed. 859. reversed.»
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The Federal Reporter73. West Publishing Co. 1896. p. 470. Archivado desde el original el 13 de mayo de 2010. Consultado el 21 de abril de 2013. «The Rockwell patent, No. 471,982, for a bicycle bell, consisting of a combination of a base plate, with a revoluble striker bar, spring-actuated in one direction, a lever operatively connected therewith, and adapted to rotate the striker bar in opposition to the force of the spring, and a gong, held invalid because of anticipation by the English patent, No. 2,425, of June 22, 1877, to Alfred Bennett, for improvements in call bells, door bells, etc. 64 Fed. 859. reversed.»
