# Relationship history for MSHA mine 4404842

Current hierarchy: **Robert L  Worley → Dome Coal Company Inc → 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

- **controller_controls_mine:** Robert L  Worley → No 1 Surface; 1977-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Otis Inez Coal Company Inc → No 1 Surface; 1977-09-01 to 1978-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Honaker Otis → No 1 Surface; 1977-09-01 to 1978-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Honaker Otis → Otis Inez Coal Company Inc; 1977-09-01 to 1978-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Dome Coal Company Inc → No 1 Surface; 1978-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Worley → Dome Coal Company Inc; 1978-06-21 to current/open; source msha-controller-operator-history