# Relationship history for MSHA mine 5001584

Current hierarchy: **Kathy  Purviance; Dennis D  Purviance → Valley Block & Concrete → Valley Block & Concrete**

- 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:** Lawrence  Ousky → Valley Block & Concrete; 1988-07-15 to 1990-09-10; source msha-controller-operator-history
- **operator_operates_mine:** United States Cement Company → Valley Block & Concrete; 1989-07-01 to 1990-09-10; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence  Ousky → United States Cement Company; 1989-07-01 to 1990-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Valley Block & Concrete → Valley Block & Concrete; 1990-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kathy  Purviance et al → Valley Block & Concrete; 1990-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kathy  Purviance et al → Valley Block & Concrete; 1990-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis D  Purviance et al → Valley Block & Concrete; 1990-09-11 to current/open; source msha-controller-operator-history