# Relationship history for MSHA mine 4703660

Current hierarchy: **Deborah K  Rivard; Michael L  Rivard → Rivard Stone, Inc → Emery Anderson**

- 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:** Deborah K  Rivard et al → Emery Anderson; 2003-04-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rivard Stone, Inc → Emery Anderson; 2012-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deborah K  Rivard et al → Rivard Stone, Inc; 2012-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael L  Rivard et al → Rivard Stone, Inc; 2012-06-19 to current/open; source msha-controller-operator-history