# Relationship history for MSHA mine 1601466

Current hierarchy: **Chadrick G  Starkey; Tyra S  Starkey → S & S Equipment Services, LLC → Jacobs Plant**

- 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 & S Equipment Services, LLC → Jacobs Plant; 2007-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tyra S  Starkey et al → Jacobs Plant; 2007-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tyra S  Starkey et al → S & S Equipment Services, LLC; 2007-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chadrick G  Starkey et al → S & S Equipment Services, LLC; 2007-09-10 to current/open; source msha-controller-operator-history