# Relationship history for MSHA mine 0504345

Current hierarchy: **Brian L  Carpenter → M & M Mining Company → Snow Storm Pit**

- 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:** Zigan Ted → Snow Storm Pit; 1981-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Zigan Sand & Gravel Inc → Snow Storm Pit; 1988-05-01 to 1989-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Zigan Ted → Zigan Sand & Gravel Inc; 1988-05-01 to 1989-07-11; source msha-controller-operator-history
- **operator_operates_mine:** M & M Mining Company → Snow Storm Pit; 1989-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brian L  Carpenter → Snow Storm Pit; 1989-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian L  Carpenter → M & M Mining Company; 1989-07-12 to current/open; source msha-controller-operator-history