# Relationship history for MSHA mine 4104466

Current hierarchy: **Daniel O  Corrigan; Traeger L  Hamilton → The Gravel Company, LLC → Blackburn**

- 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:** Tristar Aggregates Inc. → Blackburn; 2004-03-25 to 2009-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Lasca A  Arnold → Blackburn; 2004-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lasca A  Arnold → Tristar Aggregates Inc.; 2004-03-25 to 2009-02-01; source msha-controller-operator-history
- **operator_operates_mine:** Tristar Aggregates 1,LLC → Blackburn; 2009-02-02 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Daniel O  Corrigan et al → Blackburn; 2009-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel O  Corrigan et al → Tristar Aggregates 1,LLC; 2009-02-02 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Traeger L  Hamilton et al → Tristar Aggregates 1,LLC; 2009-02-02 to 2013-12-31; source msha-controller-operator-history
- **operator_operates_mine:** The Gravel Company, LLC → Blackburn; 2014-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel O  Corrigan et al → Blackburn; 2014-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel O  Corrigan et al → The Gravel Company, LLC; 2014-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Traeger L  Hamilton et al → The Gravel Company, LLC; 2014-01-01 to current/open; source msha-controller-operator-history