# Relationship history for MSHA mine 0503916

Current hierarchy: **Berg Randall W → Intermountain Mining Ltd → Glory Hole Mill Annex**

- 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:** Berg Randall W → Glory Hole Mill Annex; 1982-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Intermountain Mining Ltd → Glory Hole Mill Annex; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Berg Randall W → Intermountain Mining Ltd; 1983-11-01 to current/open; source msha-controller-operator-history