# Relationship history for MSHA mine 1511984

Current hierarchy: **Taylor Harry → Carolene Coal Company Inc → 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

- **controller_controls_mine:** Dennison J B → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Darby B Corp → No 1 Mine; 1979-07-01 to 1981-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Dennison J B → Darby B Corp; 1979-07-01 to 1981-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Polly James & George Boggs Jr → No 1 Mine; 1980-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Betty Jane Coal Company Inc → No 1 Mine; 1981-10-01 to 1983-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Polly James & George Boggs Jr → Betty Jane Coal Company Inc; 1981-10-01 to 1983-04-05; source msha-controller-operator-history
- **operator_operates_mine:** Carolene Coal Company Inc → No 1 Mine; 1983-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Taylor Harry → No 1 Mine; 1983-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Harry → Carolene Coal Company Inc; 1983-04-06 to current/open; source msha-controller-operator-history