# Relationship history for MSHA mine 4703622

Current hierarchy: **Frederick  Schindler → Marawood Construction Services, Inc. → H - 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:** Marawood Construction Services Inc → H - Pit; 2011-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frederick  Schindler → H - Pit; 2011-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frederick  Schindler → Marawood Construction Services Inc; 2011-09-08 to current/open; source msha-controller-operator-history