# Relationship history for MSHA mine 4104291

Current hierarchy: **Sammy  Fritsch → D's Gravel → Pit #1**

- 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:** D's Gravel → Pit #1; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sammy  Fritsch → Pit #1; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sammy  Fritsch → D's Gravel; 2001-06-01 to current/open; source msha-controller-operator-history