# Relationship history for MSHA mine 5100306

Current hierarchy: **Heather  Ramanlal → MEI Corporation → MEI-PP1**

- 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:** MEI Corporation → MEI-PP1; 2011-07-25 to 2012-03-19; source msha-controller-operator-history
- **controller_controls_mine:** Heather  Ramanlal → MEI-PP1; 2011-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heather  Ramanlal → MEI Corporation; 2011-07-25 to 2012-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Donaldson Enterprise, Inc. → MEI-PP1; 2012-03-20 to 2013-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Donaldson → MEI-PP1; 2012-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Donaldson → Donaldson Enterprise, Inc.; 2012-03-20 to 2013-04-30; source msha-controller-operator-history
- **operator_operates_mine:** MEI Corporation → MEI-PP1; 2013-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heather  Ramanlal → MEI Corporation; 2013-05-01 to current/open; source msha-controller-operator-history