# Relationship history for MSHA mine 1519874

Current hierarchy: **Conrad  Whitaker; Jonathan  Whitaker → Denali Energy Group LLC → Sugar Hill**

- 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

- **controller_controls_mine:** Conrad  Whitaker et al → Sugar Hill; 2010-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank  Parks → Sugar Hill; 2011-03-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Frank Parks Contract Augering Inc → Sugar Hill; 2019-10-31 to 2020-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Parks → Frank Parks Contract Augering Inc; 2019-10-31 to 2020-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Denali Energy Group LLC → Sugar Hill; 2020-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Conrad  Whitaker et al → Denali Energy Group LLC; 2020-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jonathan  Whitaker et al → Denali Energy Group LLC; 2020-03-01 to current/open; source msha-controller-operator-history