# Relationship history for MSHA mine 4202145

Current hierarchy: **Don  Nelson; Ordel  Simper → S & N Quarrys → S&N QUARRYS**

- 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:** S & N Quarrys → S&N QUARRYS; 1996-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ordel  Simper et al → S&N QUARRYS; 1996-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ordel  Simper et al → S & N Quarrys; 1996-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Nelson et al → S & N Quarrys; 1996-08-01 to current/open; source msha-controller-operator-history