# Relationship history for MSHA mine 1700869

Current hierarchy: **Randy  Gardner → Gardner Construction Enterprises → Sprague 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Gardner Construction Enterprises → Sprague Quarry; 2010-12-17 to 2012-12-10; source msha-controller-operator-history
- **controller_controls_mine:** Randy  Gardner → Sprague Quarry; 2010-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Gardner → Gardner Construction Enterprises; 2010-12-17 to 2012-12-10; source msha-controller-operator-history
- **operator_operates_mine:** Gardner Construction Enterprises → Sprague Quarry; 2012-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randy  Gardner → Sprague Quarry; 2012-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Gardner → Gardner Construction Enterprises; 2012-12-11 to current/open; source msha-controller-operator-history