# Relationship history for MSHA mine 4606115

Current hierarchy: **Thomas G  Toler → D & K Coal Company Inc → Mine No 4a**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Pammlid Coal Company → Mine No 4a; 1979-12-01 to 1981-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Jackson Kit E → Mine No 4a; 1979-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jackson Kit E → Pammlid Coal Company; 1979-12-01 to 1981-08-05; source msha-controller-operator-history
- **operator_operates_mine:** D & K Coal Company → Mine No 4a; 1981-08-06 to 1983-10-04; source msha-controller-operator-history
- **controller_controls_mine:** Adams Edgel E → Mine No 4a; 1981-08-06 to 1983-10-04; source msha-controller-operator-history
- **controller_controls_operator:** Adams Edgel E → D & K Coal Company; 1981-08-06 to 1983-10-04; source msha-controller-operator-history
- **operator_operates_mine:** D & K Coal Company Inc → Mine No 4a; 1983-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas G  Toler → Mine No 4a; 1983-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas G  Toler → D & K Coal Company Inc; 1983-10-05 to current/open; source msha-controller-operator-history