# Relationship history for MSHA mine 4201420

Current hierarchy: **Ellis Virgle E → V & V Mining → Shell Mine**

- 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:** Lammert Mining Company → Shell Mine; 1950-01-01 to 1986-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Lammert James → Shell Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lammert James → Lammert Mining Company; 1950-01-01 to 1986-01-27; source msha-controller-operator-history
- **operator_operates_mine:** V & V Mining → Shell Mine; 1986-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ellis Virgle E Et Al → Shell Mine; 1986-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ellis Virgle E Et Al → V & V Mining; 1986-01-28 to current/open; source msha-controller-operator-history