# Relationship history for MSHA mine 2402674

Current hierarchy: **John Frazer  Childs; Donald Fess  Foster → Minerals Development Group LLC → MDG Portable 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:** Minerals Development Group LLC → MDG Portable 1; 2014-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joe L  Nicholls et al → MDG Portable 1; 2014-05-19 to 2014-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Joe L  Nicholls et al → Minerals Development Group LLC; 2014-05-19 to 2014-05-20; source msha-controller-operator-history
- **controller_controls_operator:** John  Childs et al → Minerals Development Group LLC; 2014-05-19 to 2014-05-20; source msha-controller-operator-history
- **controller_controls_mine:** John Frazer  Childs et al → MDG Portable 1; 2014-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John Frazer  Childs et al → Minerals Development Group LLC; 2014-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald Fess  Foster et al → Minerals Development Group LLC; 2014-05-21 to current/open; source msha-controller-operator-history