# Relationship history for MSHA mine 1514676

Current hierarchy: **King Henry → Nomad Coal Company → 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:** Wilson Irene → No 1 Mine; 1979-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Spike Construction Company Inc → No 1 Mine; 1984-06-01 to 1984-09-26; source msha-controller-operator-history
- **controller_controls_operator:** Wilson Irene → Spike Construction Company Inc; 1984-06-01 to 1984-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Lee W Coal Company Inc → No 1 Mine; 1984-09-27 to 1985-12-15; source msha-controller-operator-history
- **controller_controls_mine:** Shelby L  Wilson et al → No 1 Mine; 1984-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shelby L  Wilson et al → Lee W Coal Company Inc; 1984-09-27 to 1985-12-15; source msha-controller-operator-history
- **operator_operates_mine:** Nomad Coal Company → No 1 Mine; 1985-12-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** King Henry → No 1 Mine; 1985-12-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** King Henry → Nomad Coal Company; 1985-12-16 to current/open; source msha-controller-operator-history