# Relationship history for MSHA mine 3003780

Current hierarchy: **Steven  Gregg; Barbara A Lopke → Lopke Quarries, Inc. → Stedman Crusher Unit # PC021 s/n:D3257**

- 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:** Frank S  Lopke → Stedman Crusher Unit # PC021 s/n:D3257; 2009-06-01 to 2021-01-29; source msha-controller-operator-history
- **operator_operates_mine:** Lopke Quarries, Inc. → Stedman Crusher Unit # PC021 s/n:D3257; 2011-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank S  Lopke → Lopke Quarries, Inc.; 2011-06-01 to 2021-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Estate of Frank S Lopke → Stedman Crusher Unit # PC021 s/n:D3257; 2021-01-30 to 2022-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Estate of Frank S Lopke → Lopke Quarries, Inc.; 2021-01-30 to 2022-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Barbara A Lopke et al → Stedman Crusher Unit # PC021 s/n:D3257; 2022-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barbara A Lopke et al → Lopke Quarries, Inc.; 2022-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven  Gregg et al → Lopke Quarries, Inc.; 2022-08-15 to current/open; source msha-controller-operator-history