# Relationship history for MSHA mine 3502782

Current hierarchy: **Claterbos Harry Company → Harry Claterbos Company → Barth Falls No 2**

- 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:** Sunset Crushed Rock Company Inc → Barth Falls No 2; 1950-01-01 to 1980-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Sunset Crushed Rock Company Inc → Barth Falls No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sunset Crushed Rock Company Inc → Sunset Crushed Rock Company Inc; 1950-01-01 to 1980-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Harry Claterbos Company → Barth Falls No 2; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Claterbos Harry Company → Barth Falls No 2; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Claterbos Harry Company → Harry Claterbos Company; 1980-06-01 to current/open; source msha-controller-operator-history