# Relationship history for MSHA mine 4703963

Current hierarchy: **Mark W  Erickson; Travis C  Erickson; Jordan L  Erickson → Erickson Excavating of Cumberland, Inc. → RM Mobile Impactor**

- 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:** Mark  Erickson → RM Mobile Impactor; 1994-09-01 to 2013-02-14; source msha-controller-operator-history
- **controller_controls_mine:** Mark W  Erickson et al → RM Mobile Impactor; 2013-02-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Erickson Excavating of Cumberland, Inc. → RM Mobile Impactor; 2024-08-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark W  Erickson et al → Erickson Excavating of Cumberland, Inc.; 2024-08-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jordan L  Erickson et al → Erickson Excavating of Cumberland, Inc.; 2024-08-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Travis C  Erickson et al → Erickson Excavating of Cumberland, Inc.; 2024-08-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Erickson → Erickson Excavating of Cumberland, Inc.; 2024-08-14 to 2013-02-14; source msha-controller-operator-history