# Relationship history for MSHA mine 4702869

Current hierarchy: **William  Sonnentag → County Ready Mix Corp → Merrill 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Tim  Sonnentag et al → Merrill Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** County Concrete Corp → Merrill Plant; 1987-11-01 to 2005-05-24; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Sonnentag et al → County Concrete Corp; 1987-11-01 to 2005-05-24; source msha-controller-operator-history
- **operator_operates_mine:** County Materials Corp → Merrill Plant; 2005-05-25 to 2023-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Sonnentag et al → Merrill Plant; 2005-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Sonnentag et al → County Materials Corp; 2005-05-25 to 2023-03-08; source msha-controller-operator-history
- **operator_operates_mine:** County Ready Mix Corp → Merrill Plant; 2023-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Sonnentag → Merrill Plant; 2023-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Sonnentag → County Ready Mix Corp; 2023-03-09 to current/open; source msha-controller-operator-history