# Relationship history for MSHA mine 1519137

Current hierarchy: **Larry T  Glass → Hart County Stone → Indian Creek 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:** Larry T  Glass → Indian Creek Quarry; 1992-03-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hart County Stone → Indian Creek Quarry; 2007-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry T  Glass → Hart County Stone; 2007-08-15 to current/open; source msha-controller-operator-history