# Relationship history for MSHA mine 1508207

Current hierarchy: **Mc Kenzie Charles → Mcd Inc → No 1 Surface Mine**

- 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

- **operator_operates_mine:** Mcd Inc → No 1 Surface Mine; 1975-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Kenzie Charles → No 1 Surface Mine; 1975-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Kenzie Charles → Mcd Inc; 1975-04-07 to current/open; source msha-controller-operator-history