# Relationship history for MSHA mine 1513202

Current hierarchy: **Engle Bill → Lantern 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:** Harvey  Napier → No 1; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shields Mining Company Inc → No 1; 1981-11-01 to 1984-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Jones Robert L → No 1; 1981-11-01 to 1984-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Jones Robert L → Shields Mining Company Inc; 1981-11-01 to 1984-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Bon Trucking Company Inc → No 1; 1984-04-30 to 1984-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Harvey  Napier → Bon Trucking Company Inc; 1984-04-30 to 1984-11-25; source msha-controller-operator-history
- **operator_operates_mine:** Lantern Coal Company Inc → No 1; 1984-11-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Engle Bill → No 1; 1984-11-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Engle Bill → Lantern Coal Company Inc; 1984-11-26 to current/open; source msha-controller-operator-history