# Relationship history for MSHA mine 4407151

Current hierarchy: **David K  Swindell → Energy Technologies, Inc. → Appalachia Remining #2**

- 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:** David K  Swindell → Appalachia Remining #2; 2004-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Technologies, Inc. → Appalachia Remining #2; 2005-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David K  Swindell → Energy Technologies, Inc.; 2005-08-23 to current/open; source msha-controller-operator-history