# Relationship history for MSHA mine 4703033

Current hierarchy: **Mark W  Erickson; Travis C  Erickson; Jordan L  Erickson → Erickson Excavating → CRUSHER NO. 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

- **operator_operates_mine:** Erickson Excavating → CRUSHER NO. 1; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Erickson → CRUSHER NO. 1; 1994-09-01 to 2013-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Erickson → Erickson Excavating; 1994-09-01 to 2013-02-14; source msha-controller-operator-history
- **controller_controls_mine:** Travis C  Erickson et al → CRUSHER NO. 1; 2013-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Travis C  Erickson et al → Erickson Excavating; 2013-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark W  Erickson et al → Erickson Excavating; 2013-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jordan L  Erickson et al → Erickson Excavating; 2013-02-15 to current/open; source msha-controller-operator-history