# Relationship history for MSHA mine 1700860

Current hierarchy: **Ronald Paul  MacQuinn Jr → Harold MacQuinn Inc. → Read Portable Screen**

- 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

- **controller_controls_mine:** Ronald Paul  MacQuinn Jr → Read Portable Screen; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harold MacQuinn Inc. → Read Portable Screen; 2010-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald Paul  MacQuinn Jr → Harold MacQuinn Inc.; 2010-06-30 to current/open; source msha-controller-operator-history