# Relationship history for MSHA mine 0504946

Current hierarchy: **Robert B  Glarner; P David  Glarner → GRCO LLC → Overlook 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Kenneth J  Evans → Overlook Mine; 2008-03-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Overlook Mine  LLC → Overlook Mine; 2011-07-16 to 2021-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth J  Evans → Overlook Mine  LLC; 2011-07-16 to 2021-05-04; source msha-controller-operator-history
- **operator_operates_mine:** GRCO LLC → Overlook Mine; 2021-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert B  Glarner et al → Overlook Mine; 2021-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert B  Glarner et al → GRCO LLC; 2021-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** P David  Glarner et al → GRCO LLC; 2021-05-05 to current/open; source msha-controller-operator-history