# Relationship history for MSHA mine 4607528

Current hierarchy: **Boblett James W → Newport Trading Company Inc → Mine No 5**

- 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:** Boblett James W → Mine No 5; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shepperd William B → Mine No 5; 1987-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gem Mining Company → Mine No 5; 1988-06-01 to 1988-12-19; source msha-controller-operator-history
- **controller_controls_operator:** Shepperd William B → Gem Mining Company; 1988-06-01 to 1988-12-19; source msha-controller-operator-history
- **operator_operates_mine:** Newport Trading Company Inc → Mine No 5; 1988-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boblett James W → Newport Trading Company Inc; 1988-12-20 to current/open; source msha-controller-operator-history