# Relationship history for MSHA mine 0402779

Current hierarchy: **Weaver William O-Robert V Neilsen → Camino Sand & Gravel → Camino 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Camino Rock Company → Camino Sand & Gravel; 1950-01-01 to 1979-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Davis Wallace A → Camino Sand & Gravel; 1950-01-01 to 1979-12-20; source msha-controller-operator-history
- **controller_controls_operator:** Davis Wallace A → Camino Rock Company; 1950-01-01 to 1979-12-20; source msha-controller-operator-history
- **operator_operates_mine:** Camino Sand & Gravel → Camino Sand & Gravel; 1979-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Weaver William O-Robert V Neilsen Et Al → Camino Sand & Gravel; 1979-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Weaver William O-Robert V Neilsen Et Al → Camino Sand & Gravel; 1979-12-21 to current/open; source msha-controller-operator-history