# Relationship history for MSHA mine 3609399

Current hierarchy: **Snyder Associated Companies Inc → Allegheny Mineral Corp. → North Washington**

- 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:** Snyder Associated Companies Inc → North Washington; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Aloe et al → North Washington; 1989-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quality Aggregates Inc. → North Washington; 2006-04-25 to 2013-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Aloe et al → Quality Aggregates Inc.; 2006-04-25 to 2013-06-25; source msha-controller-operator-history
- **operator_operates_mine:** Allegheny Mineral Corp. → North Washington; 2013-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Snyder Associated Companies Inc → Allegheny Mineral Corp.; 2013-06-26 to current/open; source msha-controller-operator-history