# Relationship history for MSHA mine 4101793

Current hierarchy: **Frost Jack → Onion Creek Gravel Inc → Onion Creek 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:** Onion Creek Managment Inc → Onion Creek Gravel; 1950-01-01 to 1982-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Schuhmacher L F → Onion Creek Gravel; 1950-01-01 to 1982-04-16; source msha-controller-operator-history
- **controller_controls_operator:** Schuhmacher L F → Onion Creek Managment Inc; 1950-01-01 to 1982-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Onion Creek Gravel Inc → Onion Creek Gravel; 1982-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frost Jack → Onion Creek Gravel; 1982-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frost Jack → Onion Creek Gravel Inc; 1982-04-17 to current/open; source msha-controller-operator-history