# Relationship history for MSHA mine 5001475

Current hierarchy: **Purviance Denny → A-Plus Concrete → A-Plus 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

- **operator_operates_mine:** Bills Backhoe Services → A-Plus Concrete; 1984-07-01 to 1985-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Decker Bill → A-Plus Concrete; 1984-07-01 to 1985-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Decker Bill → Bills Backhoe Services; 1984-07-01 to 1985-05-15; source msha-controller-operator-history
- **operator_operates_mine:** Ready Aggregate → A-Plus Concrete; 1985-05-16 to 1987-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Pittman Joe R → A-Plus Concrete; 1985-05-16 to 1987-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Pittman Joe R → Ready Aggregate; 1985-05-16 to 1987-07-31; source msha-controller-operator-history
- **operator_operates_mine:** A-Plus Concrete → A-Plus Concrete; 1987-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Purviance Denny → A-Plus Concrete; 1987-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Purviance Denny → A-Plus Concrete; 1987-08-01 to current/open; source msha-controller-operator-history