# Relationship history for MSHA mine 1512844

Current hierarchy: **Kilburn Waltis & Mervin Dunn → V M & K Coal Company → 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:** J & T Enterprise → No 1; 1981-04-01 to 1981-09-07; source msha-controller-operator-history
- **controller_controls_mine:** Powers Joseph & Fred Johnson → No 1; 1981-04-01 to 1981-09-07; source msha-controller-operator-history
- **controller_controls_operator:** Powers Joseph & Fred Johnson → J & T Enterprise; 1981-04-01 to 1981-09-07; source msha-controller-operator-history
- **operator_operates_mine:** Lester Brothers Coal Company → No 1; 1981-09-08 to 1982-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Lester Robert E-Hubert J & Jack D → No 1; 1981-09-08 to 1983-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Lester Robert E-Hubert J & Jack D → Lester Brothers Coal Company; 1981-09-08 to 1982-01-13; source msha-controller-operator-history
- **operator_operates_mine:** V M & K Coal Company → No 1; 1982-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kilburn Waltis & Mervin Dunn → No 1; 1982-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kilburn Waltis & Mervin Dunn → V M & K Coal Company; 1982-01-14 to current/open; source msha-controller-operator-history