# Relationship history for MSHA mine 3800095

Current hierarchy: **Bruce  Poston; Merland A  Poston → Mineral Mining Company Inc → Kershaw Mine & Mill**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Mineral Mining Corp → Kershaw Mine & Mill; 1950-01-01 to 2000-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Jack W  Robinson → Kershaw Mine & Mill; 1950-01-01 to 2000-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Jack W  Robinson → Mineral Mining Corp; 1950-01-01 to 2000-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Mineral Mining Company Inc → Kershaw Mine & Mill; 2001-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Merland A  Poston et al → Kershaw Mine & Mill; 2001-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Merland A  Poston et al → Mineral Mining Company Inc; 2001-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce  Poston et al → Mineral Mining Company Inc; 2001-01-01 to current/open; source msha-controller-operator-history