# Relationship history for MSHA mine 0800968

Current hierarchy: **Westberry H L Paving-Trucking-Bulldozing Inc → H L Westberry Paving Inc → H L Westberry Rock & Fill**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Northwest Sand & Fill Corp → H L Westberry Rock & Fill; 1980-10-01 to 1981-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Bates Ralph → H L Westberry Rock & Fill; 1980-10-01 to 1981-07-30; source msha-controller-operator-history
- **controller_controls_operator:** Bates Ralph → Northwest Sand & Fill Corp; 1980-10-01 to 1981-07-30; source msha-controller-operator-history
- **operator_operates_mine:** H L Westberry Paving Inc → H L Westberry Rock & Fill; 1981-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Westberry H L Paving-Trucking-Bulldozing Inc → H L Westberry Rock & Fill; 1981-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westberry H L Paving-Trucking-Bulldozing Inc → H L Westberry Paving Inc; 1981-07-31 to current/open; source msha-controller-operator-history