# Relationship history for MSHA mine 1001754

Current hierarchy: **Thiel Daryl → American Materials Inc → Portable S & G**

- 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:** American Materials Inc → Portable S & G; 1986-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thiel Daryl → Portable S & G; 1986-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thiel Daryl → American Materials Inc; 1986-07-01 to current/open; source msha-controller-operator-history