# Relationship history for MSHA mine 4703470

Current hierarchy: **William  Sonnentag → County Ready Mix Corp → Lake Tom Screen 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Tim  Sonnentag et al → Lake Tom Screen Plant; 2005-05-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** County Materials Corp → Lake Tom Screen Plant; 2006-06-28 to 2026-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Sonnentag et al → County Materials Corp; 2006-06-28 to 2026-08-19; source msha-controller-operator-history
- **controller_controls_mine:** William  Sonnentag → Lake Tom Screen Plant; 2023-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** County Ready Mix Corp → Lake Tom Screen Plant; 2026-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Sonnentag → County Ready Mix Corp; 2026-08-20 to current/open; source msha-controller-operator-history