# Relationship history for MSHA mine 3200861

Current hierarchy: **William  Klein → Material Resources, Inc. → Plant 1**

- 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:** Material Resources, Inc. → Plant 1; 2010-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Klein → Plant 1; 2010-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Klein → Material Resources, Inc.; 2010-04-27 to current/open; source msha-controller-operator-history