# Relationship history for MSHA mine 2103469

Current hierarchy: **Eric L  Howard → Collin Sand And Gravel → Collin Sand And Gravel**

- 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:** Collin Sand And Gravel → Collin Sand And Gravel; 2004-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eric L  Howard → Collin Sand And Gravel; 2004-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric L  Howard → Collin Sand And Gravel; 2004-09-22 to current/open; source msha-controller-operator-history