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3877640
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Information
Patent Grant
3877640
References
Source
Patent Number
3,877,640
Date Filed
Not available
Date Issued
Tuesday, April 15, 1975
49 years ago
CPC
E01B3/20 - Sleeper construction for special purposes
E01B1/001 - Track with ballast
E01B9/306 - the clip being a shaped plate
E01B27/18 - by introducing additional fresh material under the sleepers
E01B2203/062 - New ballast
E01B2203/067 - Special methods for posing or quantifying ballast
US Classifications
238 - Railways: surface track
104 - Railways
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