# Relationship history for MSHA mine 4103744

Current hierarchy: **William K  Sadler → Hill Country Aggregates Inc → HILL COUNTRY AGGREGATES INC**

- 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

- **controller_controls_mine:** William K  Sadler → HILL COUNTRY AGGREGATES INC; 1980-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hill Country Aggregates Inc → HILL COUNTRY AGGREGATES INC; 1992-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William K  Sadler → Hill Country Aggregates Inc; 1992-06-01 to current/open; source msha-controller-operator-history