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1565697
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Patent Grant
1565697
References
Source
Patent Number
1,565,697
Date Filed
Not available
Date Issued
Tuesday, December 15, 1925
99 years ago
CPC
E01B27/18 - by introducing additional fresh material under the sleepers
E01B2203/067 - Special methods for posing or quantifying ballast
US Classifications
104 - Railways
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