# Relationship history for MSHA mine 1700448

Current hierarchy: **S C Holdings Inc → Sargent Corporation → PTBL Wash Plant # 800003**

- 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:** H E Sargent Inc → PTBL Wash Plant # 800003; 1950-01-01 to 2010-05-25; source msha-controller-operator-history
- **controller_controls_mine:** James G  Sargent → PTBL Wash Plant # 800003; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James G  Sargent → H E Sargent Inc; 1950-01-01 to 2010-05-25; source msha-controller-operator-history
- **controller_controls_mine:** S C Holdings Inc → PTBL Wash Plant # 800003; 1997-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sargent Corporation → PTBL Wash Plant # 800003; 2010-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S C Holdings Inc → Sargent Corporation; 2010-05-26 to current/open; source msha-controller-operator-history