# Relationship history for MSHA mine 1519626

Current hierarchy: **Karen A  Stephens; Melodye G  Stephens; David A  Lester → Augustus Augering & Contracting, Inc → MC S/N 22**

- 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

- **controller_controls_mine:** William A  Stephens et al → MC S/N 22; 2008-12-02 to 2015-04-24; source msha-controller-operator-history
- **operator_operates_mine:** Augustus Augering & Contracting, Inc → MC S/N 22; 2011-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William A  Stephens et al → Augustus Augering & Contracting, Inc; 2011-09-30 to 2015-04-24; source msha-controller-operator-history
- **controller_controls_mine:** David A  Lester et al → MC S/N 22; 2015-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David A  Lester et al → Augustus Augering & Contracting, Inc; 2015-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Karen A  Stephens et al → Augustus Augering & Contracting, Inc; 2015-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Melodye G  Stephens et al → Augustus Augering & Contracting, Inc; 2015-04-25 to current/open; source msha-controller-operator-history