# Relationship history for MSHA mine 4103434

Current hierarchy: **Ron  Muhich → Simpson Stone Company → Simpson Stone Company**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Simpson'S Sons → Simpson Stone Company; 1986-09-01 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Jimmy  Simpson  et al → Simpson Stone Company; 1986-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy  Simpson  et al → Simpson'S Sons; 1986-09-01 to 2005-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Simpson Stone Company → Simpson Stone Company; 2006-01-01 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Brenda  Simpson Wilbur et al → Simpson Stone Company; 2006-01-01 to 2012-07-03; source msha-controller-operator-history
- **controller_controls_operator:** Brenda  Simpson Wilbur et al → Simpson Stone Company; 2006-01-01 to 2012-07-03; source msha-controller-operator-history
- **controller_controls_mine:** Simpson Stone Partners → Simpson Stone Company; 2012-07-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Simpson Stone Partners → Simpson Stone Company; 2012-07-04 to 2012-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Simpson Stone Company → Simpson Stone Company; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ron  Muhich → Simpson Stone Company; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Muhich → Simpson Stone Company; 2013-01-01 to current/open; source msha-controller-operator-history