# Relationship history for MSHA mine 1508188

Current hierarchy: **Phillips Marshall → Mako Mining Inc → No 1 Surface**

- 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:** Mako Mining Inc → No 1 Surface; 1975-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Phillips Marshall → No 1 Surface; 1975-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phillips Marshall → Mako Mining Inc; 1975-03-15 to current/open; source msha-controller-operator-history