# Relationship history for MSHA mine 4101702

Current hierarchy: **Sparkman Material Company → Sparkman Material Company → Sparkman Washing And Screening Plan**

- 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:** Sparkman Material Company → Sparkman Washing And Screening Plan; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sparkman Material Company → Sparkman Washing And Screening Plan; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sparkman Material Company → Sparkman Material Company; 1950-01-01 to current/open; source msha-controller-operator-history