# Relationship history for MSHA mine 2501129

Current hierarchy: **Larry  Dolezal → Dolezal Sand & Gravel → Dolezal Sand & Gravel North**

- 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

- **operator_operates_mine:** Dolezal Sand & Gravel → Dolezal Sand & Gravel North; 1950-01-01 to 1991-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Dolezal Sand & Gravel → Dolezal Sand & Gravel North; 1950-01-01 to 1991-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Dolezal Sand & Gravel → Dolezal Sand & Gravel; 1950-01-01 to 1991-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Dolezal → Dolezal Sand & Gravel North; 1985-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dolezal Sand & Gravel → Dolezal Sand & Gravel North; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Dolezal → Dolezal Sand & Gravel; 1991-04-01 to current/open; source msha-controller-operator-history