# Relationship history for MSHA mine 2200577

Current hierarchy: **James Michael  Grant → Grant Gravel Company → Pit #2**

- 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:** James Michael  Grant → Pit #2; 1983-08-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Grant Gravel Company → Pit #2; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James Michael  Grant → Grant Gravel Company; 1986-01-01 to current/open; source msha-controller-operator-history