# Relationship history for MSHA mine 0401104

Current hierarchy: **Pressed Down, Inc; Terry  Suzuki → PROTECH MINERALS, LLC → Protech Minerals, LLC**

- 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:** Pfizer Inc → Protech Minerals, LLC; 1950-01-01 to 1989-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Minerals Technologies Inc → Protech Minerals, LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Minerals Technologies Inc → Pfizer Inc; 1950-01-01 to 1989-12-11; source msha-controller-operator-history
- **operator_operates_mine:** Conservation Fund → Protech Minerals, LLC; 1989-12-12 to 1990-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Patrick  Noonan → Protech Minerals, LLC; 1989-12-12 to 1990-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Patrick  Noonan → Conservation Fund; 1989-12-12 to 1990-06-26; source msha-controller-operator-history
- **operator_operates_mine:** B F M Associates Inc → Protech Minerals, LLC; 1990-06-27 to 1991-09-06; source msha-controller-operator-history
- **controller_controls_mine:** Vincent  Fenelon → Protech Minerals, LLC; 1990-06-27 to 1991-09-06; source msha-controller-operator-history
- **controller_controls_operator:** Vincent  Fenelon → B F M Associates Inc; 1990-06-27 to 1991-09-06; source msha-controller-operator-history
- **operator_operates_mine:** B F M Associates Inc → Protech Minerals, LLC; 1991-09-07 to 1996-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Morita Gerold → Protech Minerals, LLC; 1991-09-07 to 1996-01-07; source msha-controller-operator-history
- **controller_controls_operator:** Morita Gerold → B F M Associates Inc; 1991-09-07 to 1996-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Protech Minerals Inc → Protech Minerals, LLC; 1996-01-08 to 2016-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Chul L  Choe → Protech Minerals, LLC; 1996-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chul L  Choe → Protech Minerals Inc; 1996-01-08 to 2016-07-24; source msha-controller-operator-history
- **operator_operates_mine:** PROTECH MINERALS, LLC → Protech Minerals, LLC; 2016-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pressed Down, Inc → Protech Minerals, LLC; 2016-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pressed Down, Inc → PROTECH MINERALS, LLC; 2016-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry  Suzuki et al → PROTECH MINERALS, LLC; 2016-07-25 to current/open; source msha-controller-operator-history