# Relationship history for MSHA mine 4608338

Current hierarchy: **Sanden G A → Link Resources Inc → North Branch Operations**

- 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:** United Energy Service Corp → North Branch Operations; 1993-08-01 to 1994-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Gilbert Associates Inc → North Branch Operations; 1993-08-01 to 1994-02-05; source msha-controller-operator-history
- **controller_controls_operator:** Gilbert Associates Inc → United Energy Service Corp; 1993-08-01 to 1994-02-05; source msha-controller-operator-history
- **operator_operates_mine:** R W Beck Plant Management Ltd → North Branch Operations; 1994-02-06 to 1995-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Beck R W → North Branch Operations; 1994-02-06 to 1995-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Beck R W → R W Beck Plant Management Ltd; 1994-02-06 to 1995-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Link Resources Inc → North Branch Operations; 1995-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sanden G A → North Branch Operations; 1995-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sanden G A → Link Resources Inc; 1995-04-01 to current/open; source msha-controller-operator-history