# Relationship history for MSHA mine 3606629

Current hierarchy: **Altmire Brothers Coal Company Inc → Lakeside Coal Company Inc → Geiger Strip**

- 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:** Altmire Brothers Coal Company Inc → Geiger Strip; 1975-08-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lakeside Coal Company Inc → Geiger Strip; 1978-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Altmire Brothers Coal Company Inc → Lakeside Coal Company Inc; 1978-01-01 to current/open; source msha-controller-operator-history