# Relationship history for MSHA mine 2902218

Current hierarchy: **Dwight E Mock; Rock I Southway → Carrizo Sand & Gravel, LLC → CARRIZO 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:** Toney Aggregates Inc → CARRIZO PIT; 2001-04-01 to 2002-02-14; source msha-controller-operator-history
- **controller_controls_mine:** Shane  Mc Dade → CARRIZO PIT; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shane  Mc Dade → Toney Aggregates Inc; 2001-04-01 to 2002-02-14; source msha-controller-operator-history
- **operator_operates_mine:** Carrizo Sand & Gravel, LLC → CARRIZO PIT; 2002-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dwight E Mock  et al → CARRIZO PIT; 2002-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dwight E Mock  et al → Carrizo Sand & Gravel, LLC; 2002-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rock I Southway  et al → Carrizo Sand & Gravel, LLC; 2002-02-15 to current/open; source msha-controller-operator-history