# Relationship history for MSHA mine 3503443

Current hierarchy: **Darrel A  Nelson → Freeman Rock Enterprises Inc → PORTABLE CRUSHER #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:** Ted L  Freeman Jr → PORTABLE CRUSHER #1; 1977-04-01 to 2016-02-25; source msha-controller-operator-history
- **operator_operates_mine:** Freeman Rock Enterprises Inc → PORTABLE CRUSHER #1; 1997-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ted L  Freeman Jr → Freeman Rock Enterprises Inc; 1997-07-01 to 2016-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Darrel A  Nelson → PORTABLE CRUSHER #1; 2016-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darrel A  Nelson → Freeman Rock Enterprises Inc; 2016-02-26 to current/open; source msha-controller-operator-history