# Relationship history for MSHA mine 1000312

Current hierarchy: **Davis R E → Colonial Concrete Inc → Colonial Concrete 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:** Colonial Concrete Inc → Colonial Concrete Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davis R E → Colonial Concrete Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis R E → Colonial Concrete Inc; 1950-01-01 to current/open; source msha-controller-operator-history