# Relationship history for MSHA mine 4102792

Current hierarchy: **Benjamin  Davis → Beck Readymix Concrete Company → Beck Pit & 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

- **operator_operates_mine:** Beck Concrete Company → Beck Pit & Plant; 1978-03-09 to 1985-12-03; source msha-controller-operator-history
- **controller_controls_mine:** Beck Ralph L → Beck Pit & Plant; 1978-03-09 to 1985-12-03; source msha-controller-operator-history
- **controller_controls_operator:** Beck Ralph L → Beck Concrete Company; 1978-03-09 to 1985-12-03; source msha-controller-operator-history
- **operator_operates_mine:** Beck Readymix Concrete Company → Beck Pit & Plant; 1985-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin  Davis → Beck Pit & Plant; 1985-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin  Davis → Beck Readymix Concrete Company; 1985-12-04 to current/open; source msha-controller-operator-history