# Relationship history for MSHA mine 1900363

Current hierarchy: **E H Perkins Construction Inc → Quinn Perkins S & G Inc → QUINN PERKINS S & G, INC.**

- 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:** Thomas Quinn Company Inc → QUINN PERKINS S & G, INC.; 1950-01-01 to 1979-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Edward J  Quinn → QUINN PERKINS S & G, INC.; 1950-01-01 to 1979-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Edward J  Quinn → Thomas Quinn Company Inc; 1950-01-01 to 1979-09-04; source msha-controller-operator-history
- **operator_operates_mine:** Quinn Perkins S & G Inc → QUINN PERKINS S & G, INC.; 1979-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** E H Perkins Construction Inc → QUINN PERKINS S & G, INC.; 1979-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** E H Perkins Construction Inc → Quinn Perkins S & G Inc; 1979-09-05 to current/open; source msha-controller-operator-history