# Relationship history for MSHA mine 3102200

Current hierarchy: **Robert D  Parker; Monica P  Parker → R. P. C. Contracting Co., Inc. → Griggs Pit**

- 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:** R. P. C. Contracting Co., Inc. → Griggs Pit; 2004-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert D  Parker et al → Griggs Pit; 2004-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert D  Parker et al → R. P. C. Contracting Co., Inc.; 2004-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Monica P  Parker et al → R. P. C. Contracting Co., Inc.; 2004-08-24 to current/open; source msha-controller-operator-history