# Relationship history for MSHA mine 1515587

Current hierarchy: **Parsons Loyall-Dale → W & P Coal Company Inc → Mine 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

- **controller_controls_mine:** Parsons Loyall-Dale Et Al → Mine No 2; 1985-09-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** G & R Coal Company → Mine No 2; 1986-04-01 to 1986-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Banks Greg Et Al → Mine No 2; 1986-04-01 to 1986-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Banks Greg Et Al → G & R Coal Company; 1986-04-01 to 1986-09-04; source msha-controller-operator-history
- **operator_operates_mine:** A & B Coal Company → Mine No 2; 1986-09-05 to 1987-10-26; source msha-controller-operator-history
- **controller_controls_mine:** Adams Herbert & Ray Jr Et Al → Mine No 2; 1986-09-05 to 1987-10-26; source msha-controller-operator-history
- **controller_controls_operator:** Adams Herbert & Ray Jr Et Al → A & B Coal Company; 1986-09-05 to 1987-10-26; source msha-controller-operator-history
- **operator_operates_mine:** W & P Coal Company Inc → Mine No 2; 1987-10-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Parsons Loyall-Dale Et Al → W & P Coal Company Inc; 1987-10-27 to current/open; source msha-controller-operator-history