# Relationship history for MSHA mine 0503978

Current hierarchy: **Kauffman John G Jr → Bemrose Mining Company → Bemrose Placer**

- 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

- **operator_operates_mine:** Bemrose Mining Company → Bemrose Placer; 1984-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kauffman John G Jr → Bemrose Placer; 1984-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kauffman John G Jr → Bemrose Mining Company; 1984-08-01 to current/open; source msha-controller-operator-history