# Relationship history for MSHA mine 4801290

Current hierarchy: **EH Oftedal & Sons Inc → Oftedal Construction Inc → Oftedal 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:** Richard  Gilpatrick → Oftedal Crusher #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gilpatrick Construction Company Inc → Oftedal Crusher #1; 1979-01-01 to 1999-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Gilpatrick → Gilpatrick Construction Company Inc; 1979-01-01 to 1999-07-25; source msha-controller-operator-history
- **controller_controls_mine:** EH Oftedal & Sons Inc → Oftedal Crusher #1; 1995-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oftedal Construction Inc → Oftedal Crusher #1; 1999-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** EH Oftedal & Sons Inc → Oftedal Construction Inc; 1999-07-26 to current/open; source msha-controller-operator-history