# Relationship history for MSHA mine 3401888

Current hierarchy: **Rick D  Bumpers → Stigler Stone Co. Inc. → Scott Quarry**

- 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:** Rick D  Bumpers → Scott Quarry; 1987-06-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stigler Stone Co. Inc. → Scott Quarry; 2002-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick D  Bumpers → Stigler Stone Co. Inc.; 2002-03-27 to current/open; source msha-controller-operator-history