# Relationship history for MSHA mine 1700984

Current hierarchy: **S C Holdings Inc → SARGENT CORPORATION → Queen City 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

- **controller_controls_mine:** S C Holdings Inc → Queen City Quarry; 1997-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randy  Gardner → Queen City Quarry; 2012-12-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gardner Construction Enterprises LLC → Queen City Quarry; 2016-06-22 to 2026-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Gardner → Gardner Construction Enterprises LLC; 2016-06-22 to 2026-07-01; source msha-controller-operator-history
- **operator_operates_mine:** SARGENT CORPORATION → Queen City Quarry; 2026-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S C Holdings Inc → SARGENT CORPORATION; 2026-07-02 to current/open; source msha-controller-operator-history