# Relationship history for MSHA mine 3401991

Current hierarchy: **David  Sherwood → Greenhill Sand → Greenhill Sand 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

- **operator_operates_mine:** Ken Laster Company → Greenhill Sand 2; 2006-01-09 to 2008-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth D Laster → Greenhill Sand 2; 2006-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth D Laster → Ken Laster Company; 2006-01-09 to 2008-05-15; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Creek Materials, LLC → Greenhill Sand 2; 2008-05-16 to 2011-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Farley et al → Greenhill Sand 2; 2008-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Farley et al → Mountain Creek Materials, LLC; 2008-05-16 to 2011-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Laster et al → Mountain Creek Materials, LLC; 2008-05-16 to 2011-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Creek Products LLC → Greenhill Sand 2; 2011-03-01 to 2021-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Fugitt → Greenhill Sand 2; 2011-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Fugitt → Mountain Creek Products LLC; 2011-03-01 to 2021-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Greenhill Sand → Greenhill Sand 2; 2021-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Sherwood → Greenhill Sand 2; 2021-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Sherwood → Greenhill Sand; 2021-05-14 to current/open; source msha-controller-operator-history