# Relationship history for MSHA mine 4103926

Current hierarchy: **Divin Darlene → Tri-Co Services & Sand Inc → TRI-C0 SERV.& SAND,INC. PIT #1**

- 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:** Tri-Co Services & Sand Inc → TRI-C0 SERV.& SAND,INC. PIT #1; 1996-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Divin Darlene → TRI-C0 SERV.& SAND,INC. PIT #1; 1996-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Divin Darlene → Tri-Co Services & Sand Inc; 1996-09-01 to current/open; source msha-controller-operator-history