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by devices moving underneath the track, e.g. ballast sleighs

by devices moving underneath the track, e.g. ballast sleighs · Cooperative Patent Classification (CPC)

Building, mining, and civil engineering structures.

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Mapped technology topics for this CPC code.

CPC classification statistics
Metric	Value
CPC code	E01B27/021
Official title	{by devices moving underneath the track, e.g. ballast sleighs}
Display label	by devices moving underneath the track, e.g. ballast sleighs
Total patents	4

Year-over-year patent counts classified under this CPC code.

Filing activity appears stable based on the most recent years.

Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.