# Relationship history for MSHA mine 2003007

Current hierarchy: **Edward C  Levy Jr → American Aggregates of Michigan Inc → Imlay 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:** Northeast Aggregate Inc → Imlay Sand and Gravel; 1997-05-01 to 1999-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Francis  Manchik → Imlay Sand and Gravel; 1997-05-01 to 1999-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Francis  Manchik → Northeast Aggregate Inc; 1997-05-01 to 1999-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Edward C  Levy Jr et al → Imlay Sand and Gravel; 1997-05-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Racz Construction Inc → Imlay Sand and Gravel; 1999-06-14 to 2000-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Racz Darryl L → Imlay Sand and Gravel; 1999-06-14 to 2000-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Racz Darryl L → Racz Construction Inc; 1999-06-14 to 2000-05-18; source msha-controller-operator-history
- **operator_operates_mine:** American Aggregates of Michigan Inc → Imlay Sand and Gravel; 2000-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward C  Levy Jr et al → American Aggregates of Michigan Inc; 2000-05-19 to current/open; source msha-controller-operator-history