# Relationship history for MSHA mine 1507276

Current hierarchy: **Weddington Joe D → Royal Coal Corp → 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:** Hurn Franklin M & Raymond A Smego → No 1 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Royal Coal Corp → No 1 Surface; 1974-08-20 to 1977-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Justice Muncy → No 1 Surface; 1974-08-20 to 1977-12-09; source msha-controller-operator-history
- **controller_controls_operator:** Justice Muncy → Royal Coal Corp; 1974-08-20 to 1977-12-09; source msha-controller-operator-history
- **operator_operates_mine:** F & R Coal Company Inc → No 1 Surface; 1977-12-10 to 1978-09-24; source msha-controller-operator-history
- **controller_controls_operator:** Hurn Franklin M & Raymond A Smego → F & R Coal Company Inc; 1977-12-10 to 1978-09-24; source msha-controller-operator-history
- **operator_operates_mine:** Royal Coal Corp → No 1 Surface; 1978-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Weddington Joe D → No 1 Surface; 1978-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Weddington Joe D → Royal Coal Corp; 1978-09-25 to current/open; source msha-controller-operator-history