# Relationship history for MSHA mine 4801839

Current hierarchy: **Mark  Schmidt; Ken  Rempel → Summit Excavation & Grading, LLC → RM100**

- 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:** Summit Excavation & Grading, LLC → RM100; 2020-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Schmidt et al → RM100; 2020-07-16 to 2023-10-16; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Schmidt et al → Summit Excavation & Grading, LLC; 2020-07-16 to 2023-10-16; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Loewen et al → Summit Excavation & Grading, LLC; 2020-07-16 to 2023-10-16; source msha-controller-operator-history
- **controller_controls_operator:** Ken  Rempel et al → Summit Excavation & Grading, LLC; 2020-07-16 to 2023-10-16; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Schmidt et al → RM100; 2023-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Schmidt et al → Summit Excavation & Grading, LLC; 2023-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ken  Rempel et al → Summit Excavation & Grading, LLC; 2023-10-17 to current/open; source msha-controller-operator-history