# Relationship history for MSHA mine 5400276

Current hierarchy: **Melba  Figueroa; Edgar  Figueroa → P R Concrete Products Inc → P R Concrete Planta Talco**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Arturo  Pico Jr → P R Concrete Planta Talco; 1950-01-01 to 1996-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Terrazos Pico Inc → P R Concrete Planta Talco; 1984-04-01 to 1986-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Santiago Arturo Pico → P R Concrete Planta Talco; 1984-04-01 to 1986-01-16; source msha-controller-operator-history
- **controller_controls_operator:** Santiago Arturo Pico → Terrazos Pico Inc; 1984-04-01 to 1986-01-16; source msha-controller-operator-history
- **operator_operates_mine:** Puerto Rico Concrete Products Incorporated → P R Concrete Planta Talco; 1986-01-17 to 1996-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Arturo  Pico Jr → Puerto Rico Concrete Products Incorporated; 1986-01-17 to 1996-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Edgar  Figueroa et al → P R Concrete Planta Talco; 1996-01-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P R Concrete Products Inc → P R Concrete Planta Talco; 1996-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edgar  Figueroa et al → P R Concrete Products Inc; 1996-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Melba  Figueroa et al → P R Concrete Products Inc; 1996-04-01 to current/open; source msha-controller-operator-history