# Relationship history for MSHA mine 1700966

Current hierarchy: **Darren R Emerson; Dennis R Emerson → Emerson Excavating → Royal River 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:** Emerson Excavating → Royal River Pit; 2015-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darren R Emerson et al → Royal River Pit; 2015-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darren R Emerson et al → Emerson Excavating; 2015-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis R Emerson et al → Emerson Excavating; 2015-10-05 to current/open; source msha-controller-operator-history