# Relationship history for MSHA mine 0201913

Current hierarchy: **Arizona Silver Corp → Corval Development Inc → Corval Mill**

- 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:** Boriana Mining Corp → Corval Mill; 1979-01-01 to 1980-05-27; source msha-controller-operator-history
- **controller_controls_mine:** Musselman James C → Corval Mill; 1979-01-01 to 1980-05-27; source msha-controller-operator-history
- **controller_controls_operator:** Musselman James C → Boriana Mining Corp; 1979-01-01 to 1980-05-27; source msha-controller-operator-history
- **controller_controls_mine:** Arizona Silver Corp → Corval Mill; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** C M Inc → Corval Mill; 1980-02-01 to 1984-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Mindy Inc → Corval Mill; 1980-05-28 to 1984-07-31; source msha-controller-operator-history
- **controller_controls_operator:** C M Inc → Mindy Inc; 1980-05-28 to 1984-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Corval Development Inc → Corval Mill; 1984-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arizona Silver Corp → Corval Development Inc; 1984-08-01 to current/open; source msha-controller-operator-history