# Relationship history for MSHA mine 1800305

Current hierarchy: **Steven D  Ward → Marshyhope Operations LLC → Rosser Pit**

- 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:** J Edwin Rosser Inc → Rosser Pit; 1950-01-01 to 1979-10-30; source msha-controller-operator-history
- **controller_controls_mine:** Rosser J Edwin → Rosser Pit; 1950-01-01 to 1979-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Rosser J Edwin → J Edwin Rosser Inc; 1950-01-01 to 1979-10-30; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Corp → Rosser Pit; 1979-10-31 to 2002-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Simpson George B → Rosser Pit; 1979-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Simpson George B → Eastern Corp; 1979-10-31 to 2002-03-26; source msha-controller-operator-history
- **operator_operates_mine:** Marshyhope Sand and Gravel LLC → Rosser Pit; 2002-03-27 to 2018-08-06; source msha-controller-operator-history
- **controller_controls_mine:** Nick T  Russell et al → Rosser Pit; 2002-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick T  Russell et al → Marshyhope Sand and Gravel LLC; 2002-03-27 to 2018-08-06; source msha-controller-operator-history
- **controller_controls_operator:** Monica M  Russell et al → Marshyhope Sand and Gravel LLC; 2002-03-27 to 2018-08-06; source msha-controller-operator-history
- **operator_operates_mine:** Marshyhope Operations LLC → Rosser Pit; 2018-08-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steven D  Ward → Rosser Pit; 2018-08-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven D  Ward → Marshyhope Operations LLC; 2018-08-07 to current/open; source msha-controller-operator-history