# Relationship history for MSHA mine 1512527

Current hierarchy: **Bobby Joe  Hensley → Bob & Tom Coal Company Inc → No 3**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Donnie T  Hoskins et al → No 3; 1977-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bobby Joe  Hensley → No 3; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Trent Coal Company → No 3; 1980-09-01 to 1981-03-15; source msha-controller-operator-history
- **controller_controls_operator:** Donnie T  Hoskins et al → Trent Coal Company; 1980-09-01 to 1981-03-15; source msha-controller-operator-history
- **operator_operates_mine:** Bob & Tom Coal Company Inc → No 3; 1981-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bobby Joe  Hensley → Bob & Tom Coal Company Inc; 1981-03-16 to current/open; source msha-controller-operator-history