# Relationship history for MSHA mine 4103336

Current hierarchy: **Milam Sam Joe → Bronco Sand & Gravel → Bronco Sand & Gravel 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Bronco Sand & Gravel → Bronco Sand & Gravel Pit; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Milam Sam Joe → Bronco Sand & Gravel Pit; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Milam Sam Joe → Bronco Sand & Gravel; 1985-09-01 to current/open; source msha-controller-operator-history