# Relationship history for MSHA mine 4201441

Current hierarchy: **Lammert Tom → Lammert Mining → Almost 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:** Uranium Production Company Inc → Almost Mine; 1950-01-01 to 1979-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Uranium Production Company Inc → Almost Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Uranium Production Company Inc → Uranium Production Company Inc; 1950-01-01 to 1979-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Lammert Mining → Almost Mine; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lammert Tom Et Al → Almost Mine; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lammert Tom Et Al → Lammert Mining; 1979-11-01 to current/open; source msha-controller-operator-history