# Relationship history for MSHA mine 0103439

Current hierarchy: **Robert D  Word; Joe  Hibbs → Riverview Development, LLC. → Riverview Mine 40-Acre Tract**

- 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:** Riverview Development, LLC. → Riverview Mine 40-Acre Tract; 2013-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert D  Word et al → Riverview Mine 40-Acre Tract; 2013-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert D  Word et al → Riverview Development, LLC.; 2013-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe  Hibbs et al → Riverview Development, LLC.; 2013-04-15 to current/open; source msha-controller-operator-history