# Relationship history for MSHA mine 4406433

Current hierarchy: **Bolling Gina S → Pick & Shovel Inc → #1 Strip & Auger**

- 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:** Pick & Shovel Inc → #1 Strip & Auger; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bolling Gina S → #1 Strip & Auger; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bolling Gina S → Pick & Shovel Inc; 1987-10-01 to current/open; source msha-controller-operator-history