# Relationship history for MSHA mine 2902488

Current hierarchy: **Walter L  Meech → C & E Concrete, Inc. → CR #2**

- 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:** Walter L  Meech → CR #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & E Concrete, Inc. → CR #2; 2017-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter L  Meech → C & E Concrete, Inc.; 2017-12-19 to current/open; source msha-controller-operator-history