# Relationship history for MSHA mine 4401619

Current hierarchy: **Metz Glade → Trio Coal Corp → No 1**

- 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:** Mc Cloud Coal Company → No 1; 1950-01-01 to 1977-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Skeens Dewey & Robert Pugh → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Skeens Dewey & Robert Pugh → Mc Cloud Coal Company; 1950-01-01 to 1977-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Trio Coal Corp → No 1; 1977-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Metz Glade → No 1; 1977-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metz Glade → Trio Coal Corp; 1977-04-01 to current/open; source msha-controller-operator-history