# Relationship history for MSHA mine 4103885

Current hierarchy: **Usherwood Chad & Shawn → Scb Company → SCB CO MATERIALS DIV**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Scb Company → SCB CO MATERIALS DIV; 1996-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Usherwood Chad & Shawn → SCB CO MATERIALS DIV; 1996-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Usherwood Chad & Shawn → Scb Company; 1996-02-01 to current/open; source msha-controller-operator-history