# Relationship history for MSHA mine 4101328

Current hierarchy: **Wall T C → High Plains Concrete Company Inc → Wylie Pit**

- 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:** High Plains Pavers Inc → Wylie Pit; 1950-01-01 to 1983-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Wall H A → Wylie Pit; 1950-01-01 to 1983-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Wall H A → High Plains Pavers Inc; 1950-01-01 to 1983-02-02; source msha-controller-operator-history
- **operator_operates_mine:** High Plains Concrete Company Inc → Wylie Pit; 1983-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wall T C → Wylie Pit; 1983-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wall T C → High Plains Concrete Company Inc; 1983-02-03 to current/open; source msha-controller-operator-history