# Relationship history for MSHA mine 1514385

Current hierarchy: **Tackett John G → Tackett & Spears Coal Company Inc → No 1**

- 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:** Newsom Rofolo → No 1; 1978-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J J Coal Company Inc → No 1; 1983-12-01 to 1986-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Newsom Rofolo → J J Coal Company Inc; 1983-12-01 to 1986-01-19; source msha-controller-operator-history
- **operator_operates_mine:** Tackett & Spears Coal Company Inc → No 1; 1986-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tackett John G → No 1; 1986-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tackett John G → Tackett & Spears Coal Company Inc; 1986-01-20 to current/open; source msha-controller-operator-history