# Relationship history for MSHA mine 0504691

Current hierarchy: **Garrett  Varra; Pasquale  Varra → Varra Companies, Inc → Gunnison**

- 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:** Pasquale  Varra et al → Gunnison; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Melvin R  Gydesen  et al → Gunnison; 1999-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Concrete & Gravel Llc → Gunnison; 2000-09-01 to 2003-11-12; source msha-controller-operator-history
- **controller_controls_operator:** Melvin R  Gydesen  et al → American Concrete & Gravel Llc; 2000-09-01 to 2003-11-12; source msha-controller-operator-history
- **operator_operates_mine:** Varra Companies, Inc → Gunnison; 2003-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pasquale  Varra et al → Varra Companies, Inc; 2003-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Garrett  Varra et al → Varra Companies, Inc; 2003-11-13 to current/open; source msha-controller-operator-history