# Relationship history for MSHA mine 4202073

Current hierarchy: **Lloyd Mark K & Joseph R → R P C Inc → R P C Portable Crusher**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** R P C Inc → R P C Portable Crusher; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lloyd Mark K & Joseph R → R P C Portable Crusher; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lloyd Mark K & Joseph R → R P C Inc; 1992-04-01 to current/open; source msha-controller-operator-history