# Relationship history for MSHA mine 4103195

Current hierarchy: **Cementos Pacasmayo SSA → Suzorite Mineral Products → Suzorite Mineral Products-Pits**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** M W  Glenn Sr → Suzorite Mineral Products-Pits; 1950-01-01 to 1985-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Talc Company Inc → Suzorite Mineral Products-Pits; 1983-08-01 to 1985-11-30; source msha-controller-operator-history
- **controller_controls_operator:** M W  Glenn Sr → Pioneer Talc Company Inc; 1983-08-01 to 1985-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Talc Company → Suzorite Mineral Products-Pits; 1985-12-01 to 1994-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Whittaker-Clark & Daniels Inc → Suzorite Mineral Products-Pits; 1985-12-01 to 1994-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Whittaker-Clark & Daniels Inc → Pioneer Talc Company; 1985-12-01 to 1994-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Zemex Corp → Suzorite Mineral Products-Pits; 1994-12-01 to 2003-03-02; source msha-controller-operator-history
- **operator_operates_mine:** Suzorite Mineral Products → Suzorite Mineral Products-Pits; 1995-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zemex Corp → Suzorite Mineral Products; 1995-01-01 to 2003-03-02; source msha-controller-operator-history
- **controller_controls_mine:** Cementos Pacasmayo SSA → Suzorite Mineral Products-Pits; 2003-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cementos Pacasmayo SSA → Suzorite Mineral Products; 2003-03-03 to current/open; source msha-controller-operator-history