# Relationship history for MSHA mine 4104847

Current hierarchy: **Kevin  Steinhauser; Nicole  Ponewash; Virginia  Steinhauser → Ecology Minerals Inc → Ecology Grinding Plant**

- 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

- **operator_operates_mine:** Ecology Minerals Inc → Ecology Grinding Plant; 2010-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald E  Steinhauser → Ecology Grinding Plant; 2010-12-03 to 2023-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Ronald E  Steinhauser → Ecology Minerals Inc; 2010-12-03 to 2023-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Nicole  Ponewash et al → Ecology Grinding Plant; 2024-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicole  Ponewash et al → Ecology Minerals Inc; 2024-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Virginia  Steinhauser et al → Ecology Minerals Inc; 2024-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Steinhauser et al → Ecology Minerals Inc; 2024-01-01 to current/open; source msha-controller-operator-history