# Relationship history for MSHA mine 3600963

Current hierarchy: **Joseph P  Tassone → Mon-View Mining Corp → Mathies**

- 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:** Mathies Coal Company → Mathies; 1950-01-01 to 1993-09-30; source msha-controller-operator-history
- **controller_controls_mine:** National Steel Corp et al → Mathies; 1950-01-01 to 1993-09-30; source msha-controller-operator-history
- **controller_controls_operator:** National Steel Corp et al → Mathies Coal Company; 1950-01-01 to 1993-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Mon-View Mining Corp → Mathies; 1993-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph P  Tassone et al → Mathies; 1993-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph P  Tassone et al → Mon-View Mining Corp; 1993-10-01 to current/open; source msha-controller-operator-history