# Relationship history for MSHA mine 1701179

Current hierarchy: **Crystal Arlene Hallowell; Merrill Richard Hallowell → Hallowell Construction → Red Gate Gravel**

- 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:** Hallowell Construction → Red Gate Gravel; 2026-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Crystal Arlene Hallowell et al → Red Gate Gravel; 2026-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crystal Arlene Hallowell et al → Hallowell Construction; 2026-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Merrill Richard Hallowell et al → Hallowell Construction; 2026-04-20 to current/open; source msha-controller-operator-history