# Relationship history for MSHA mine 1517791

Current hierarchy: **Tuboscope Inc → Brandt Company → Brandt #1**

- 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:** Steele Charlie → Brandt #1; 1989-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Charlie Steele Inc → Brandt #1; 1996-05-01 to 1997-10-13; source msha-controller-operator-history
- **controller_controls_operator:** Steele Charlie → Charlie Steele Inc; 1996-05-01 to 1997-10-13; source msha-controller-operator-history
- **operator_operates_mine:** Brandt Company → Brandt #1; 1997-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tuboscope Inc → Brandt #1; 1997-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tuboscope Inc → Brandt Company; 1997-10-14 to current/open; source msha-controller-operator-history