# Relationship history for MSHA mine 1509655

Current hierarchy: **Spencer William → Stoney Fork Coal Company → Stoney 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** A & W Coal Company → Stoney No 1; 1976-04-01 to 1981-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Adams Jimmy & Robert Wells → Stoney No 1; 1976-04-01 to 1981-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Adams Jimmy & Robert Wells → A & W Coal Company; 1976-04-01 to 1981-01-13; source msha-controller-operator-history
- **operator_operates_mine:** Stoney Fork Coal Company → Stoney No 1; 1981-01-14 to 1989-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Rodney L  Partin et al → Stoney No 1; 1981-01-14 to 1989-12-04; source msha-controller-operator-history
- **controller_controls_operator:** Rodney L  Partin et al → Stoney Fork Coal Company; 1981-01-14 to 1989-12-04; source msha-controller-operator-history
- **operator_operates_mine:** Stoney Fork Coal Company → Stoney No 1; 1989-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Spencer William Et Al → Stoney No 1; 1989-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Spencer William Et Al → Stoney Fork Coal Company; 1989-12-05 to current/open; source msha-controller-operator-history