# Relationship history for MSHA mine 0202609

Current hierarchy: **Robert K  Larson → J T S Construction Inc. → Daley Pit**

- 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:** Scarborough Plumbing Sand & Gravel → Daley Pit; 1993-12-01 to 2004-03-28; source msha-controller-operator-history
- **controller_controls_mine:** Scarborough Win → Daley Pit; 1993-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scarborough Win → Scarborough Plumbing Sand & Gravel; 1993-12-01 to 2004-03-28; source msha-controller-operator-history
- **operator_operates_mine:** J T S Construction Inc. → Daley Pit; 2004-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert K  Larson → Daley Pit; 2004-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert K  Larson → J T S Construction Inc.; 2004-03-29 to current/open; source msha-controller-operator-history