# Relationship history for MSHA mine 2200704

Current hierarchy: **Victor R  Purvis → Purvis Hauling → McClain Sand and 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:** Mc Lain Sand & Gravel → McClain Sand and Gravel; 1999-02-01 to 2004-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Thomas L  Roberts → McClain Sand and Gravel; 1999-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas L  Roberts → Mc Lain Sand & Gravel; 1999-02-01 to 2004-06-08; source msha-controller-operator-history
- **operator_operates_mine:** Purvis Hauling → McClain Sand and Gravel; 2004-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Victor R  Purvis → McClain Sand and Gravel; 2004-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Victor R  Purvis → Purvis Hauling; 2004-06-09 to current/open; source msha-controller-operator-history