# Relationship history for MSHA mine 1519647

Current hierarchy: **Shannon  Burnett; Charlie  Slykhuis → SF Contracting, LLC → Gillmore No. 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

- **controller_controls_mine:** Steven  Boyd  et al → Gillmore No. 1; 2012-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Boyd & Sons Construction, LLC → Gillmore No. 1; 2012-02-07 to 2014-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Steven  Boyd  et al → Boyd & Sons Construction, LLC; 2012-02-07 to 2014-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Gregory  Boyd et al → Boyd & Sons Construction, LLC; 2012-02-07 to 2014-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Michael E  Boyd et al → Boyd & Sons Construction, LLC; 2012-02-07 to 2014-09-01; source msha-controller-operator-history
- **operator_operates_mine:** SF Contracting, LLC → Gillmore No. 1; 2014-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shannon  Burnett et al → Gillmore No. 1; 2014-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shannon  Burnett et al → SF Contracting, LLC; 2014-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charlie  Slykhuis et al → SF Contracting, LLC; 2014-09-02 to current/open; source msha-controller-operator-history