# Relationship history for MSHA mine 1505328

Current hierarchy: **Mc Ghee James-Frank Justice → Mac Mining Company → No 1 Prep Plant**

- 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

- **operator_operates_mine:** Mac Mining Company → No 1 Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Ghee James-Frank Justice Et Al → No 1 Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Ghee James-Frank Justice Et Al → Mac Mining Company; 1950-01-01 to current/open; source msha-controller-operator-history