# Relationship history for MSHA mine 4801272

Current hierarchy: **Kevin  Condos; Gail  Condos → Gravel Works Inc → REE'S ENTERPRISE**

- 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:** Bridger Valley Gravel → REE'S ENTERPRISE; 1979-01-01 to 1997-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Byrne → REE'S ENTERPRISE; 1979-01-01 to 1997-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Byrne → Bridger Valley Gravel; 1979-01-01 to 1997-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Gravel Works Inc → REE'S ENTERPRISE; 1997-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gail  Condos  et al → REE'S ENTERPRISE; 1997-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gail  Condos  et al → Gravel Works Inc; 1997-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Condos  et al → Gravel Works Inc; 1997-04-07 to current/open; source msha-controller-operator-history