# Relationship history for MSHA mine 1202071

Current hierarchy: **Gavin  Kirk; Larry  Kirk → Kirk Materials → KIRK MATERIALS**

- 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:** Kirk Materials → KIRK MATERIALS; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Kirk et al → KIRK MATERIALS; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Kirk et al → Kirk Materials; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gavin  Kirk et al → Kirk Materials; 1990-04-01 to current/open; source msha-controller-operator-history