# Relationship history for MSHA mine 1510146

Current hierarchy: **Music Charles & Moran Lewis → Music Coal Company → No 1 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Tripple M Coal Company → No 1 Surface; 1976-12-01 to 1977-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Music Charles & Charles Johnson → No 1 Surface; 1976-12-01 to 1977-03-06; source msha-controller-operator-history
- **controller_controls_operator:** Music Charles & Charles Johnson → Tripple M Coal Company; 1976-12-01 to 1977-03-06; source msha-controller-operator-history
- **operator_operates_mine:** Music Coal Company → No 1 Surface; 1977-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Music Charles & Moran Lewis → No 1 Surface; 1977-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Music Charles & Moran Lewis → Music Coal Company; 1977-03-07 to current/open; source msha-controller-operator-history