# Relationship history for MSHA mine 1509531

Current hierarchy: **Hugh  Holbrook → Holbrook Mining Company Inc → 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

- **controller_controls_mine:** Breeding Bennett & Bobby → No 2 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & J Coal Co → No 2 Mine; 1976-01-01 to 1976-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Breeding Bennett & Bobby → B & J Coal Co; 1976-01-01 to 1976-05-04; source msha-controller-operator-history
- **operator_operates_mine:** C L & N Coal Company → No 2 Mine; 1976-05-05 to 1976-11-04; source msha-controller-operator-history
- **controller_controls_mine:** Lowe Arnold Jr & Eddie Noble → No 2 Mine; 1976-05-05 to 1979-01-07; source msha-controller-operator-history
- **controller_controls_operator:** Lowe Arnold Jr & Eddie Noble → C L & N Coal Company; 1976-05-05 to 1976-11-04; source msha-controller-operator-history
- **controller_controls_mine:** Hugh  Holbrook → No 2 Mine; 1976-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Holbrook Mining Company Inc → No 2 Mine; 1976-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hugh  Holbrook → Holbrook Mining Company Inc; 1976-11-05 to current/open; source msha-controller-operator-history