# Relationship history for MSHA mine 3401971

Current hierarchy: **Dolese Brothers Company → Dolese Bros Co → Mustang Sand & Gravel Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Dolese Brothers Company → Mustang Sand & Gravel Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dolese Bros Co → Mustang Sand & Gravel Plant; 2005-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dolese Brothers Company → Dolese Bros Co; 2005-07-22 to current/open; source msha-controller-operator-history