# Relationship history for MSHA mine 1514469

Current hierarchy: **Whitehead Joel-David → B & B Coal No 2 → No 2**

- 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:** B & B Coal No 2 → No 2; 1984-02-01 to 1985-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Lawson John & Clarence Et Al → No 2; 1984-02-01 to 1985-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Lawson John & Clarence Et Al → B & B Coal No 2; 1984-02-01 to 1985-04-18; source msha-controller-operator-history
- **operator_operates_mine:** B & B Coal No 2 → No 2; 1985-04-19 to 1985-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Trent James Et Al → No 2; 1985-04-19 to 1985-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Trent James Et Al → B & B Coal No 2; 1985-04-19 to 1985-07-10; source msha-controller-operator-history
- **operator_operates_mine:** B & B Coal No 2 → No 2; 1985-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Whitehead Joel-David Et Al → No 2; 1985-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Whitehead Joel-David Et Al → B & B Coal No 2; 1985-07-11 to current/open; source msha-controller-operator-history