# Relationship history for MSHA mine 4502899

Current hierarchy: **Mosby Wayne → M & M Crushing Company Inc → Grandy Pit**

- 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:** Mosby Wayne → Grandy Pit; 1979-07-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M & M Crushing Company Inc → Grandy Pit; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mosby Wayne → M & M Crushing Company Inc; 1981-06-01 to current/open; source msha-controller-operator-history