# Relationship history for MSHA mine 0202977

Current hierarchy: **Norman M  Montgomery → Gila Rock Products, LLC → Reymert 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Gila Rock Products, LLC → Reymert Mine; 2002-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cheryl  Montgomery  et al → Reymert Mine; 2002-04-17 to 2019-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Cheryl  Montgomery  et al → Gila Rock Products, LLC; 2002-04-17 to 2019-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Norman  Montgomery  et al → Gila Rock Products, LLC; 2002-04-17 to 2019-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Norman M  Montgomery → Reymert Mine; 2019-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Norman M  Montgomery → Gila Rock Products, LLC; 2019-01-22 to current/open; source msha-controller-operator-history