# Relationship history for MSHA mine 4703417

Current hierarchy: **Mark  Sambs → Sambs Stone Products Inc → Screen Plant #2**

- 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

- **controller_controls_mine:** Mark  Sambs → Screen Plant #2; 2002-11-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sambs Stone Products Inc → Screen Plant #2; 2005-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Sambs → Sambs Stone Products Inc; 2005-04-26 to current/open; source msha-controller-operator-history