# Relationship history for MSHA mine 4502607

Current hierarchy: **M J  Mc Intyre → Concrete Nor'West Inc → Whitmarsh 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:** M J  Mc Intyre → Whitmarsh Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Concrete Nor'West Inc → Whitmarsh Pit; 1978-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** M J  Mc Intyre → Concrete Nor'West Inc; 1978-10-01 to current/open; source msha-controller-operator-history