# Relationship history for MSHA mine 1001977

Current hierarchy: **Kelly  Fulfer → Superior Construction & Excavating Inc. → Superior Construction-10 mile pit**

- 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:** Quality Sand & Gravel → Superior Construction-10 mile pit; 2000-05-01 to 2012-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Kelly  Fulfer → Superior Construction-10 mile pit; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly  Fulfer → Quality Sand & Gravel; 2000-05-01 to 2012-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Superior Construction & Excavating Inc. → Superior Construction-10 mile pit; 2012-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kelly  Fulfer → Superior Construction-10 mile pit; 2012-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly  Fulfer → Superior Construction & Excavating Inc.; 2012-08-31 to current/open; source msha-controller-operator-history