# Relationship history for MSHA mine 0202732

Current hierarchy: **Harley  Gray Jr → Drake Stone Products Inc → BLUEBIRD**

- 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

- **controller_controls_mine:** Harley  Gray Jr → BLUEBIRD; 1997-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gordon Levin → BLUEBIRD; 1997-11-01 to 2000-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Gordon  Levin → BLUEBIRD; 1997-11-01 to 2000-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Gordon  Levin → Gordon Levin; 1997-11-01 to 2000-03-26; source msha-controller-operator-history
- **operator_operates_mine:** Drake Stone Products Inc → BLUEBIRD; 2000-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harley  Gray Jr → Drake Stone Products Inc; 2000-03-27 to current/open; source msha-controller-operator-history