# Relationship history for MSHA mine 1901121

Current hierarchy: **Theodore W  Ondrick; Adam J  Ondrick → ONDRICK PORTABLE CRUSHING & PAVING, LLC → HARD ROCK PLANT #1**

- 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:** Theodore J  Ondrick → HARD ROCK PLANT #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** TED ONDRICK COMPANY LLC → HARD ROCK PLANT #1; 2003-01-01 to 2019-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Theodore J  Ondrick → TED ONDRICK COMPANY LLC; 2003-01-01 to 2019-02-26; source msha-controller-operator-history
- **operator_operates_mine:** ONDRICK PORTABLE CRUSHING & PAVING, LLC → HARD ROCK PLANT #1; 2019-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Theodore W  Ondrick et al → HARD ROCK PLANT #1; 2019-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Theodore W  Ondrick et al → ONDRICK PORTABLE CRUSHING & PAVING, LLC; 2019-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adam J  Ondrick et al → ONDRICK PORTABLE CRUSHING & PAVING, LLC; 2019-02-27 to current/open; source msha-controller-operator-history