# Relationship history for MSHA mine 2402478

Current hierarchy: **Bob L  Radcliffe; Kenneth P  Williams → River Gravel LLC → River 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** River Gravel LLC → River Gravel LLC; 2007-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bob L  Radcliffe et al → River Gravel LLC; 2007-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bob L  Radcliffe et al → River Gravel LLC; 2007-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth P  Williams et al → River Gravel LLC; 2007-04-18 to current/open; source msha-controller-operator-history