# Relationship history for MSHA mine 0403366

Current hierarchy: **J Brouwer Investments Inc → Shamrock Sand & Rock  LLC → Aguanga Plant**

- 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

- **operator_operates_mine:** Shamrock Sand & Rock Corp → Aguanga Plant; 1950-01-01 to 1985-03-05; source msha-controller-operator-history
- **controller_controls_mine:** John L  Marana → Aguanga Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John L  Marana → Shamrock Sand & Rock Corp; 1950-01-01 to 1985-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Ronald W Pharris → Aguanga Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C L Pharris Sand & Gravel Inc → Aguanga Plant; 1985-03-06 to 1992-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Ronald W Pharris → C L Pharris Sand & Gravel Inc; 1985-03-06 to 1992-01-17; source msha-controller-operator-history
- **operator_operates_mine:** Sunwest Materials → Aguanga Plant; 1992-01-18 to 1995-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Aguanga Plant; 1992-01-18 to 1995-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Sunwest Materials; 1992-01-18 to 1995-06-12; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Sand & Rock Corp → Aguanga Plant; 1995-06-13 to 2003-04-30; source msha-controller-operator-history
- **controller_controls_operator:** John L  Marana → Shamrock Sand & Rock Corp; 1995-06-13 to 2003-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Sand & Rock  LLC → Aguanga Plant; 2003-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** J Brouwer Investments Inc Et Al → Aguanga Plant; 2003-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Brouwer Investments Inc Et Al → Shamrock Sand & Rock  LLC; 2003-05-01 to current/open; source msha-controller-operator-history