# Relationship history for MSHA mine 3000927

Current hierarchy: **Carl J  Clemente → Certified Road Constructors Inc → MATERIAL SAND & 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Material Sand & Gravel Company Inc → MATERIAL SAND & GRAVEL; 1950-01-01 to 1990-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Edward D  Cammarota → MATERIAL SAND & GRAVEL; 1950-01-01 to 1990-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Edward D  Cammarota → Material Sand & Gravel Company Inc; 1950-01-01 to 1990-10-07; source msha-controller-operator-history
- **operator_operates_mine:** Certified Road Constructors Inc → MATERIAL SAND & GRAVEL; 1990-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl J  Clemente  et al → MATERIAL SAND & GRAVEL; 1990-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl J  Clemente  et al → Certified Road Constructors Inc; 1990-10-08 to current/open; source msha-controller-operator-history