# Relationship history for MSHA mine 3502886

Current hierarchy: **Collins Dale → Valley Rock Products → Dale Collins Pit**

- 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:** Three Way Portable Crushing → Dale Collins Pit; 1979-01-01 to 1980-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Dave  Hanson et al → Dale Collins Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Hanson et al → Three Way Portable Crushing; 1979-01-01 to 1980-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Wendell  Lux et al → Three Way Portable Crushing; 1979-01-01 to 1980-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Valley Rock Products → Dale Collins Pit; 1980-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Collins Dale → Dale Collins Pit; 1980-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collins Dale → Valley Rock Products; 1980-05-13 to current/open; source msha-controller-operator-history