# Relationship history for MSHA mine 2402421

Current hierarchy: **David A  Smith → Smith Contracting Inc. → Kolberg 710 KDS**

- 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:** Jack  Morgenstern et al → Kolberg 710 KDS; 1997-10-01 to 2015-08-04; source msha-controller-operator-history
- **controller_controls_mine:** David A  Smith → Kolberg 710 KDS; 2003-07-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Smith Contracting, Inc → Kolberg 710 KDS; 2005-07-26 to 2010-07-20; source msha-controller-operator-history
- **controller_controls_operator:** David A  Smith → Smith Contracting, Inc; 2005-07-26 to 2010-07-20; source msha-controller-operator-history
- **operator_operates_mine:** Century Companies Inc → Kolberg 710 KDS; 2010-07-21 to 2010-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Morgenstern et al → Century Companies Inc; 2010-07-21 to 2010-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Smith Contracting Inc. → Kolberg 710 KDS; 2010-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David A  Smith → Smith Contracting Inc.; 2010-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Robertson → Kolberg 710 KDS; 2015-08-05 to 2022-03-21; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Robertson → Century Companies Inc; 2015-08-05 to 2010-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Aaron  Golik et al → Kolberg 710 KDS; 2022-03-22 to 2023-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Aaron  Golik et al → Century Companies Inc; 2022-03-22 to 2010-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Robertson et al → Century Companies Inc; 2022-03-22 to 2010-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Aaron  Golik et al → Kolberg 710 KDS; 2023-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aaron  Golik et al → Century Companies Inc; 2023-03-15 to 2010-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Tracy  Golik et al → Century Companies Inc; 2023-03-15 to 2010-08-17; source msha-controller-operator-history