# Relationship history for MSHA mine 4002955

Current hierarchy: **Keith R  Radford; Kenneth R  Radford → M & M Gravel, LLC → M & M Gravel, LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** M & M Gravel Company → M & M Gravel, LLC; 1987-07-01 to 2012-04-30; source msha-controller-operator-history
- **controller_controls_mine:** David H  McDaniel → M & M Gravel, LLC; 1987-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David H  McDaniel → M & M Gravel Company; 1987-07-01 to 2012-04-30; source msha-controller-operator-history
- **operator_operates_mine:** M & M Gravel, LLC → M & M Gravel, LLC; 2012-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keith R  Radford et al → M & M Gravel, LLC; 2012-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith R  Radford et al → M & M Gravel, LLC; 2012-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth R  Radford et al → M & M Gravel, LLC; 2012-05-01 to current/open; source msha-controller-operator-history