# Relationship history for MSHA mine 0505080

Current hierarchy: **Levi Franklin Schofield → Schofield Excavation Inc → HP 300/ LT 106 Jaw 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Grand Gravel Pit LLC → HP 300/ LT 106 Jaw Crusher; 2017-06-14 to 2018-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Bud  Carpenter et al → HP 300/ LT 106 Jaw Crusher; 2017-06-14 to 2025-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Bud  Carpenter et al → Grand Gravel Pit LLC; 2017-06-14 to 2018-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Skylar  Carpenter et al → Grand Gravel Pit LLC; 2017-06-14 to 2018-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Schofield Excavation Inc → HP 300/ LT 106 Jaw Crusher; 2018-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Levi Franklin Schofield → HP 300/ LT 106 Jaw Crusher; 2018-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Levi Franklin Schofield → Schofield Excavation Inc; 2018-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerry Bud  Carpenter → HP 300/ LT 106 Jaw Crusher; 2025-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry Bud  Carpenter → Grand Gravel Pit LLC; 2025-05-20 to 2018-02-13; source msha-controller-operator-history