# Relationship history for MSHA mine 2103212

Current hierarchy: **Edward A Egan → Northern Con-Agg., LLP → Marshall West**

- 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

- **controller_controls_mine:** Edward A Egan → Marshall West; 1989-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northern Con-Agg Inc → Marshall West; 1999-08-01 to 2008-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Edward A Egan → Northern Con-Agg Inc; 1999-08-01 to 2008-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Northern Con-Agg., LLP → Marshall West; 2009-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edward A Egan → Marshall West; 2009-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward A Egan → Northern Con-Agg., LLP; 2009-01-01 to current/open; source msha-controller-operator-history