# Relationship history for MSHA mine 1512248

Current hierarchy: **Graham Timothy E → Edward Resources Inc → Edward Resources**

- 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:** Mbm Dredging Ltd → Edward Resources; 1979-12-01 to 1985-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Mbm Dredging Ltd → Edward Resources; 1979-12-01 to 1985-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Mbm Dredging Ltd → Mbm Dredging Ltd; 1979-12-01 to 1985-05-20; source msha-controller-operator-history
- **operator_operates_mine:** Edward Resources Inc → Edward Resources; 1985-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Graham Timothy E Et Al → Edward Resources; 1985-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graham Timothy E Et Al → Edward Resources Inc; 1985-05-21 to current/open; source msha-controller-operator-history