# Relationship history for MSHA mine 3607617

Current hierarchy: **Gentry John W → East Loop Sand Company → East Loop 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** East Loop Sand Company → East Loop Pit; 1984-09-01 to 1985-09-22; source msha-controller-operator-history
- **controller_controls_mine:** Rossman William & Michael Et Al → East Loop Pit; 1984-09-01 to 1985-09-22; source msha-controller-operator-history
- **controller_controls_operator:** Rossman William & Michael Et Al → East Loop Sand Company; 1984-09-01 to 1985-09-22; source msha-controller-operator-history
- **operator_operates_mine:** East Loop Sand Company → East Loop Pit; 1985-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gentry John W → East Loop Pit; 1985-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gentry John W → East Loop Sand Company; 1985-09-23 to current/open; source msha-controller-operator-history