# Relationship history for MSHA mine 1201760

Current hierarchy: **Campbell R Douglas → Daviess County Resources → Thomas No 1**

- 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:** Lincoln Hills Coal Company Inc → Thomas No 1; 1980-01-01 to 1980-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Mullen Joe → Thomas No 1; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mullen Joe → Lincoln Hills Coal Company Inc; 1980-01-01 to 1980-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Daviess County Resources → Thomas No 1; 1980-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Campbell R Douglas → Thomas No 1; 1980-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Campbell R Douglas → Daviess County Resources; 1980-04-14 to current/open; source msha-controller-operator-history