# Relationship history for MSHA mine 4801742

Current hierarchy: **D Scott  Sims → Synapse Inc. → Portable/Variable #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:** Stuart  Sims → Portable/Variable #2; 2005-03-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Wyoming Const. Co. → Portable/Variable #2; 2009-08-28 to 2017-07-26; source msha-controller-operator-history
- **controller_controls_operator:** Stuart  Sims → Western Wyoming Const. Co.; 2009-08-28 to 2017-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Synapse Inc. → Portable/Variable #2; 2017-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** D Scott  Sims → Portable/Variable #2; 2017-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** D Scott  Sims → Synapse Inc.; 2017-07-27 to current/open; source msha-controller-operator-history