# Relationship history for MSHA mine 1515154

Current hierarchy: **Winston Raymond & Mark Rains → Abbey Coal Company → Surface**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Abbey Coal Company → Surface; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Winston Raymond & Mark Rains → Surface; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Winston Raymond & Mark Rains → Abbey Coal Company; 1985-04-01 to current/open; source msha-controller-operator-history