# Relationship history for MSHA mine 4703584

Current hierarchy: **Frank  Schimpf → S&R Compost Services → S&R Compost Screen 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

- **operator_operates_mine:** S&R Compost Services → S&R Compost Screen 2; 2010-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank  Schimpf → S&R Compost Screen 2; 2010-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Schimpf → S&R Compost Services; 2010-04-15 to current/open; source msha-controller-operator-history