# Relationship history for MSHA mine 3102031

Current hierarchy: **Derek  Vaden → Derek Vaden Stone Works → Cedar Falls Quarry**

- 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

- **controller_controls_mine:** W L  Vaden → Cedar Falls Quarry; 1950-01-01 to 2001-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Vaden Stone Works → Cedar Falls Quarry; 1988-11-01 to 2001-01-25; source msha-controller-operator-history
- **controller_controls_operator:** W L  Vaden → Vaden Stone Works; 1988-11-01 to 2001-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Derek Vaden Stone Works → Cedar Falls Quarry; 2001-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Derek  Vaden → Cedar Falls Quarry; 2001-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Derek  Vaden → Derek Vaden Stone Works; 2001-01-26 to current/open; source msha-controller-operator-history