# Relationship history for MSHA mine 1513149

Current hierarchy: **B W  McDonald → Laurel Creek Coal Company Inc → Mine #4 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

- **controller_controls_mine:** Homer  Short → Mine #4 Surface; 1980-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Homer Short Company Inc → Mine #4 Surface; 1981-10-01 to 1988-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Homer  Short → Homer Short Company Inc; 1981-10-01 to 1988-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Creek Coal Company Inc → Mine #4 Surface; 1988-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** B W  McDonald → Mine #4 Surface; 1988-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B W  McDonald → Laurel Creek Coal Company Inc; 1988-03-23 to current/open; source msha-controller-operator-history