# Relationship history for MSHA mine 3401472

Current hierarchy: **Ross  W  Wyche → Wyche  Quarry → Wyche Quarry**

- 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:** Files Shale Quarry → Wyche Quarry; 1984-09-01 to 1992-05-05; source msha-controller-operator-history
- **controller_controls_mine:** A M  Files → Wyche Quarry; 1984-09-01 to 1992-05-05; source msha-controller-operator-history
- **controller_controls_operator:** A M  Files → Files Shale Quarry; 1984-09-01 to 1992-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Wyche Quarry → Wyche Quarry; 1992-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ross  W  Wyche → Wyche Quarry; 1992-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ross  W  Wyche → Wyche Quarry; 1992-05-06 to current/open; source msha-controller-operator-history