# Relationship history for MSHA mine 2602317

Current hierarchy: **Lynda M  Donovan → R T Donovan Company Inc → DONOVAN 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:** R T Donovan Company Inc → DONOVAN PIT; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lynda M  Donovan → DONOVAN PIT; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lynda M  Donovan → R T Donovan Company Inc; 1997-03-01 to current/open; source msha-controller-operator-history