Counter Patents
© Brooke Clarke 2006
4150432 Frequency counter and method 702/78
3304504 Feb., 1967 Horlander 364/484.
3555256 Jan., 1971 Westlake 364/701.
3609326 Sep., 1971 Bagley et al. 364/551.
3631343 Dec., 1971 Schmidhauser 324/186.
4073432 Feb., 1978 Schroder 324/78.
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