# Relationship history for MSHA mine 3607741

Current hierarchy: **Donald C  Bender; Rick  Bender → B & B Coal Company → Rock Ridge No 1 Slope**

- 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:** B & B Coal Company → Rock Ridge No 1 Slope; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rick  Bender et al → Rock Ridge No 1 Slope; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Bender et al → B & B Coal Company; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald C  Bender et al → B & B Coal Company; 1985-09-01 to current/open; source msha-controller-operator-history