# Relationship history for MSHA mine 0502688

Current hierarchy: **Bryant G H → Resource Exploration & Mining Inc → Grizzly Creek Strip**

- 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

- **controller_controls_mine:** Bryant G H → Grizzly Creek Strip; 1971-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Resource Exploration & Mining Inc → Grizzly Creek Strip; 1975-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryant G H → Resource Exploration & Mining Inc; 1975-04-01 to current/open; source msha-controller-operator-history