# Relationship history for MSHA mine 3400979

Current hierarchy: **Hammer Lew Inc → G C B Leasing Inc → W Bower Strip No 1**

- 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:** G C B Leasing Inc → W Bower Strip No 1; 1976-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hammer Lew Inc → W Bower Strip No 1; 1976-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hammer Lew Inc → G C B Leasing Inc; 1976-10-01 to current/open; source msha-controller-operator-history