# Relationship history for MSHA mine 1700518

Current hierarchy: **S C Holdings Inc → Sargent Corporation → Portable Rental Crusher**

- 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

- **controller_controls_mine:** James G  Sargent → Portable Rental Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H E Sargent Inc → Portable Rental Crusher; 1980-05-01 to 2011-06-12; source msha-controller-operator-history
- **controller_controls_operator:** James G  Sargent → H E Sargent Inc; 1980-05-01 to 2011-06-12; source msha-controller-operator-history
- **controller_controls_mine:** S C Holdings Inc → Portable Rental Crusher; 1997-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sargent Corporation → Portable Rental Crusher; 2011-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S C Holdings Inc → Sargent Corporation; 2011-06-13 to current/open; source msha-controller-operator-history