# Relationship history for MSHA mine 0901181

Current hierarchy: **Walter Allen  Mc Cannon → McCannon Granite Co Inc → Crushing Division**

- 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:** McCannon Granite Co Inc → Crushing Division; 2007-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walter Allen  Mc Cannon → Crushing Division; 2007-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter Allen  Mc Cannon → McCannon Granite Co Inc; 2007-11-07 to current/open; source msha-controller-operator-history