# Relationship history for MSHA mine 2401738

Current hierarchy: **Thorton Everett & Warren Townsend → Everdale Thorton Construction → Pardner Mine**

- 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:** Bob & Don Oversen → Pardner Mine; 1983-08-01 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Oversen Bob & Don → Pardner Mine; 1983-08-01 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Oversen Bob & Don → Bob & Don Oversen; 1983-08-01 to 1985-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Everdale Thorton Construction → Pardner Mine; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thorton Everett & Warren Townsend → Pardner Mine; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thorton Everett & Warren Townsend → Everdale Thorton Construction; 1985-07-01 to current/open; source msha-controller-operator-history