# Relationship history for MSHA mine 0405844

Current hierarchy: **Jerry E  McCasland → Turn-Key Construction Services, Inc. → T-K Springs 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

- **operator_operates_mine:** Turn-Key Construction Services, Inc. → T-K Springs Quarry; 2012-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerry E  McCasland → T-K Springs Quarry; 2012-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry E  McCasland → Turn-Key Construction Services, Inc.; 2012-04-12 to current/open; source msha-controller-operator-history