# Relationship history for MSHA mine 1515144

Current hierarchy: **Tackett Helena & Luberta → Tackett & Tackett Mining Company → No 2**

- 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:** Hamby Charles T Et Al → No 2; 1984-03-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tina Mining Company Inc → No 2; 1985-04-01 to 1985-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Hamby Charles T Et Al → Tina Mining Company Inc; 1985-04-01 to 1985-10-07; source msha-controller-operator-history
- **operator_operates_mine:** Tackett & Tackett Mining Company → No 2; 1985-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tackett Helena & Luberta → No 2; 1985-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tackett Helena & Luberta → Tackett & Tackett Mining Company; 1985-10-08 to current/open; source msha-controller-operator-history