# Relationship history for MSHA mine 1510091

Current hierarchy: **Arthur Capital Inc → Arthur 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:** Hamner Keith → No 1 Surface; 1976-05-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Greenbriar Coal Corp Inc → No 1 Surface; 1976-09-01 to 1977-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Hamner Keith → Greenbriar Coal Corp Inc; 1976-09-01 to 1977-04-03; source msha-controller-operator-history
- **operator_operates_mine:** Arthur Coal Company Inc → No 1 Surface; 1977-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arthur Capital Inc → No 1 Surface; 1977-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur Capital Inc → Arthur Coal Company Inc; 1977-04-04 to current/open; source msha-controller-operator-history