# Relationship history for MSHA mine 2401925

Current hierarchy: **Granite County-Mt → Granite County → Granite Portable**

- 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:** Reykdal Merv & John St John → Granite Portable; 1989-07-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lil Diamond Mining → Granite Portable; 1990-07-01 to 1990-09-24; source msha-controller-operator-history
- **controller_controls_operator:** Reykdal Merv & John St John → Lil Diamond Mining; 1990-07-01 to 1990-09-24; source msha-controller-operator-history
- **operator_operates_mine:** Granite County → Granite Portable; 1990-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Granite County-Mt → Granite Portable; 1990-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Granite County-Mt → Granite County; 1990-09-25 to current/open; source msha-controller-operator-history