# Relationship history for MSHA mine 4601421

Current hierarchy: **Ted  Osborne → Iaeger Construction Company Inc → Saw Pit Shop**

- 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:** United States Steel Mining Company Inc → Saw Pit Shop; 1950-01-01 to 1988-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Usx Corp → Saw Pit Shop; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Usx Corp → United States Steel Mining Company Inc; 1950-01-01 to 1988-01-04; source msha-controller-operator-history
- **operator_operates_mine:** Iaeger Construction Company Inc → Saw Pit Shop; 1988-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ted  Osborne  et al → Saw Pit Shop; 1988-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Osborne  et al → Iaeger Construction Company Inc; 1988-01-05 to current/open; source msha-controller-operator-history