# Relationship history for MSHA mine 3901139

Current hierarchy: **Reynolds H Roger → Reynolds Construction Company → Crusher Unit 403 Or Unit #403**

- 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:** Dave Gustafson & Company Inc → Crusher Unit 403 Or Unit #403; 1950-01-01 to 1978-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Gustafson Wayne → Crusher Unit 403 Or Unit #403; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gustafson Wayne → Dave Gustafson & Company Inc; 1950-01-01 to 1978-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Reynolds H Roger → Crusher Unit 403 Or Unit #403; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Reynolds Construction Company → Crusher Unit 403 Or Unit #403; 1978-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reynolds H Roger → Reynolds Construction Company; 1978-04-24 to current/open; source msha-controller-operator-history