# Relationship history for MSHA mine 2000770

Current hierarchy: **Cava Aggregates → Cava Aggregates → Cava Aggregate**

- 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:** Lamar Gravel Company Inc → Cava Aggregate; 1950-01-01 to 1979-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Lamar Gravel Company Inc → Cava Aggregate; 1950-01-01 to 1979-08-28; source msha-controller-operator-history
- **controller_controls_operator:** Lamar Gravel Company Inc → Lamar Gravel Company Inc; 1950-01-01 to 1979-08-28; source msha-controller-operator-history
- **operator_operates_mine:** Cava Aggregates → Cava Aggregate; 1979-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cava Aggregates → Cava Aggregate; 1979-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cava Aggregates → Cava Aggregates; 1979-08-29 to current/open; source msha-controller-operator-history