# Relationship history for MSHA mine 0500234

Current hierarchy: **Joseph C  Welte → Summit Pressed Brick & Tile Company → Beaver Creek Red**

- 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

- **controller_controls_mine:** Joseph C  Welte et al → Beaver Creek Red; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W T Smith Construction → Beaver Creek Red; 1950-01-01 to 1984-01-23; source msha-controller-operator-history
- **controller_controls_mine:** Smith W T → Beaver Creek Red; 1950-01-01 to 1984-01-23; source msha-controller-operator-history
- **controller_controls_operator:** Smith W T → W T Smith Construction; 1950-01-01 to 1984-01-23; source msha-controller-operator-history
- **operator_operates_mine:** Summit Pressed Brick & Tile Company → Beaver Creek Red; 1984-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph C  Welte et al → Summit Pressed Brick & Tile Company; 1984-01-24 to current/open; source msha-controller-operator-history