# Relationship history for MSHA mine 1513504

Current hierarchy: **Lane James E → B & B Coal Company → No 1 Mine**

- 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:** D & D Coal Company → No 1 Mine; 1982-05-01 to 1983-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Crawford Lawrence & Dennis Ray → No 1 Mine; 1982-05-01 to 1983-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Crawford Lawrence & Dennis Ray → D & D Coal Company; 1982-05-01 to 1983-09-01; source msha-controller-operator-history
- **operator_operates_mine:** B & B Coal Company → No 1 Mine; 1983-09-02 to 1983-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Napier Edward-Leroy Smith Et Al → No 1 Mine; 1983-09-02 to 1983-12-20; source msha-controller-operator-history
- **controller_controls_operator:** Napier Edward-Leroy Smith Et Al → B & B Coal Company; 1983-09-02 to 1983-12-20; source msha-controller-operator-history
- **operator_operates_mine:** B & B Coal Company → No 1 Mine; 1983-12-21 to 1984-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Rose Michael Et Al → No 1 Mine; 1983-12-21 to 1984-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Rose Michael Et Al → B & B Coal Company; 1983-12-21 to 1984-10-21; source msha-controller-operator-history
- **operator_operates_mine:** B & B Coal Company → No 1 Mine; 1984-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lane James E → No 1 Mine; 1984-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lane James E → B & B Coal Company; 1984-10-22 to current/open; source msha-controller-operator-history