# Relationship history for MSHA mine 4201477

Current hierarchy: **Mendisco Felix → Mendisco Mining → Repeat**

- 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:** Harold  Roberts → Repeat; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Fuels Nuclear Inc → Repeat; 1978-03-09 to 1986-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Roberts → Energy Fuels Nuclear Inc; 1978-03-09 to 1986-03-03; source msha-controller-operator-history
- **operator_operates_mine:** Tom Lammert Mining → Repeat; 1986-03-04 to 1986-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Lammert Tom → Repeat; 1986-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lammert Tom → Tom Lammert Mining; 1986-03-04 to 1986-08-26; source msha-controller-operator-history
- **operator_operates_mine:** Mendisco Mining → Repeat; 1986-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mendisco Felix → Repeat; 1986-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mendisco Felix → Mendisco Mining; 1986-08-27 to current/open; source msha-controller-operator-history