# Relationship history for MSHA mine 3605589

Current hierarchy: **Jones William L → Parkway Anthracite Inc → Jim Thorpe Rail Yard**

- 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:** Parkway Anthracite Inc → Jim Thorpe Rail Yard; 1975-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jones William L → Jim Thorpe Rail Yard; 1975-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones William L → Parkway Anthracite Inc; 1975-05-01 to current/open; source msha-controller-operator-history