# Relationship history for MSHA mine 1503789

Current hierarchy: **James R  Gibbs → Triple G Coal Corp → 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:** Blankenship & Kinder → No 1 Mine; 1971-02-16 to 1973-02-11; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship & Kinder → No 1 Mine; 1971-02-16 to 1973-02-11; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship & Kinder → Blankenship & Kinder; 1971-02-16 to 1973-02-11; source msha-controller-operator-history
- **operator_operates_mine:** Lora Coal Company → No 1 Mine; 1973-02-12 to 1973-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Lora Coal Company → No 1 Mine; 1973-02-12 to 1973-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Lora Coal Company → Lora Coal Company; 1973-02-12 to 1973-09-04; source msha-controller-operator-history
- **operator_operates_mine:** Triple G Coal Corp → No 1 Mine; 1973-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James R  Gibbs et al → No 1 Mine; 1973-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James R  Gibbs et al → Triple G Coal Corp; 1973-09-05 to current/open; source msha-controller-operator-history