# Relationship history for MSHA mine 1519143

Current hierarchy: **Calvin R  Tackett → Pine Creek Mining, Inc. → Carousel #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:** Calvin R  Tackett → Carousel #1; 2005-08-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hardshell Tipples Inc → Carousel #1; 2007-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calvin R  Tackett → Hardshell Tipples Inc; 2007-08-21 to current/open; source msha-controller-operator-history