# Relationship history for MSHA mine 4503259

Current hierarchy: **Teninty Mike & Doug Hurn → M T Circle Industrial → Smith 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:** M T Circle Industrial → Smith Quarry; 1991-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Teninty Mike & Doug Hurn → Smith Quarry; 1991-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Teninty Mike & Doug Hurn → M T Circle Industrial; 1991-11-01 to current/open; source msha-controller-operator-history