# Relationship history for MSHA mine 1201596

Current hierarchy: **Stowell Richard & C A Spragins Jr → Spencer Coal Corp → Spencer Coal Pit**

- 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:** Spencer Coal Corp → Spencer Coal Pit; 1977-09-01 to 1983-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Jimmy D  Kulbeth → Spencer Coal Pit; 1977-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy D  Kulbeth → Spencer Coal Corp; 1977-09-01 to 1983-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Spencer Coal Corp → Spencer Coal Pit; 1983-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stowell Richard & C A Spragins Jr → Spencer Coal Pit; 1983-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stowell Richard & C A Spragins Jr → Spencer Coal Corp; 1983-08-01 to current/open; source msha-controller-operator-history