# Relationship history for MSHA mine 4102843

Current hierarchy: **Weedn Roy → Southwest Sandman → Whitlow Pit & 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:** Like Sand & Gravel → Whitlow Pit & Plant; 1979-01-01 to 1986-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Like John → Whitlow Pit & Plant; 1979-01-01 to 1986-01-29; source msha-controller-operator-history
- **controller_controls_operator:** Like John → Like Sand & Gravel; 1979-01-01 to 1986-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Weedn Roy → Whitlow Pit & Plant; 1986-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southwest Sandman → Whitlow Pit & Plant; 1986-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Weedn Roy → Southwest Sandman; 1986-01-30 to current/open; source msha-controller-operator-history