# Relationship history for MSHA mine 4103855

Current hierarchy: **Heidelberg Materials AG → Campbell Concrete & Mtrls → SAND SUPPLY #4**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Genoa Industries Inc → SAND SUPPLY #4; 1995-05-01 to 1997-03-16; source msha-controller-operator-history
- **controller_controls_mine:** James B  Pace Jr → SAND SUPPLY #4; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James B  Pace Jr → Genoa Industries Inc; 1995-05-01 to 1997-03-16; source msha-controller-operator-history
- **operator_operates_mine:** Campbell Concrete & Mtrls → SAND SUPPLY #4; 1997-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Constar Inc  et al → SAND SUPPLY #4; 1997-03-17 to 2012-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Constar Inc  et al → Campbell Concrete & Mtrls; 1997-03-17 to 2012-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → SAND SUPPLY #4; 2012-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Campbell Concrete & Mtrls; 2012-01-10 to current/open; source msha-controller-operator-history