# Relationship history for MSHA mine 3608154

Current hierarchy: **Morgan David → Australian Recovery Technology U S Inc → Ralph Job**

- 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:** Morgan David → Ralph Job; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Australian Recovery Technology U S Inc → Ralph Job; 1990-03-01 to 1993-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Consolidated Metal B Z Holdings → Ralph Job; 1990-03-01 to 1993-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Consolidated Metal B Z Holdings → Australian Recovery Technology U S Inc; 1990-03-01 to 1993-03-14; source msha-controller-operator-history
- **operator_operates_mine:** Australian Recovery Technology U S Inc → Ralph Job; 1993-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morgan David → Australian Recovery Technology U S Inc; 1993-03-15 to current/open; source msha-controller-operator-history