# Relationship history for MSHA mine 2102849

Current hierarchy: **William  Gesell → Gesell Concrete Products Inc → PORTABLE CRUSHER**

- 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:** Olson Lyle W → PORTABLE CRUSHER; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Gesell → PORTABLE CRUSHER; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bemidji Blacktop Inc → PORTABLE CRUSHER; 1981-05-01 to 1985-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Olson Lyle W → Bemidji Blacktop Inc; 1981-05-01 to 1985-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Gesell Concrete Products Inc → PORTABLE CRUSHER; 1985-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Gesell → Gesell Concrete Products Inc; 1985-04-15 to current/open; source msha-controller-operator-history