# Relationship history for MSHA mine 1509421

Current hierarchy: **White Arthur Jr → B-Cde Coal Company → No 2 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:** J & I M Coal Company Inc → No 2 Mine; 1976-01-01 to 1978-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Bailey Henry S → No 2 Mine; 1976-01-01 to 1978-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Henry S → J & I M Coal Company Inc; 1976-01-01 to 1978-03-05; source msha-controller-operator-history
- **operator_operates_mine:** Walter Curry Coal Company Inc → No 2 Mine; 1978-03-06 to 1980-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Curry Walter → No 2 Mine; 1978-03-06 to 1980-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Curry Walter → Walter Curry Coal Company Inc; 1978-03-06 to 1980-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Sparks Carl E → No 2 Mine; 1978-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B-Cde Coal Company Inc → No 2 Mine; 1980-04-09 to 1980-10-19; source msha-controller-operator-history
- **controller_controls_operator:** Sparks Carl E → B-Cde Coal Company Inc; 1980-04-09 to 1980-10-19; source msha-controller-operator-history
- **operator_operates_mine:** B-Cde Coal Company → No 2 Mine; 1980-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** White Arthur Jr → No 2 Mine; 1980-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** White Arthur Jr → B-Cde Coal Company; 1980-10-20 to current/open; source msha-controller-operator-history