# Relationship history for MSHA mine 4801326

Current hierarchy: **Stuart  Sims → Western Wyoming Construction Co → Portable / Variable**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Dana L  Sims → Portable / Variable; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brasel & Sims Construction Company → Portable / Variable; 1980-06-01 to 1986-02-05; source msha-controller-operator-history
- **controller_controls_operator:** Dana L  Sims → Brasel & Sims Construction Company; 1980-06-01 to 1986-02-05; source msha-controller-operator-history
- **controller_controls_mine:** D Scott  Sims → Portable / Variable; 1985-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sims Corp → Portable / Variable; 1986-02-06 to 1994-08-16; source msha-controller-operator-history
- **controller_controls_operator:** D Scott  Sims → Sims Corp; 1986-02-06 to 1994-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Circle Paving Inc → Portable / Variable; 1994-08-17 to 2005-03-15; source msha-controller-operator-history
- **controller_controls_mine:** Dana L  Sims → Portable / Variable; 1994-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dana L  Sims → Circle Paving Inc; 1994-08-17 to 2005-03-15; source msha-controller-operator-history
- **operator_operates_mine:** Western Wyoming Construction Co → Portable / Variable; 2005-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stuart  Sims → Portable / Variable; 2005-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stuart  Sims → Western Wyoming Construction Co; 2005-03-16 to current/open; source msha-controller-operator-history