# Relationship history for MSHA mine 4703568

Current hierarchy: **Doug A  Sokup → S & S Stone Inc. → EXTEC S-5**

- 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 Stone Company → EXTEC S-5; 2009-06-25 to 2011-07-05; source msha-controller-operator-history
- **controller_controls_mine:** Douglas A  Sokup → EXTEC S-5; 2009-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas A  Sokup → S & S Stone Company; 2009-06-25 to 2011-07-05; source msha-controller-operator-history
- **operator_operates_mine:** S & S Stone Inc. → EXTEC S-5; 2011-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Doug A  Sokup et al → EXTEC S-5; 2011-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Doug A  Sokup et al → S & S Stone Inc.; 2011-07-06 to current/open; source msha-controller-operator-history