# Relationship history for MSHA mine 1002140

Current hierarchy: **Kelly  Fulfer → Quality Sand & Gravel, Inc. → QS&G Nordberg**

- 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:** Kelly  Fulfer → QS&G Nordberg; 2000-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quality Sand & Gravel, Inc. → QS&G Nordberg; 2007-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly  Fulfer → Quality Sand & Gravel, Inc.; 2007-10-05 to current/open; source msha-controller-operator-history