# Relationship history for MSHA mine 1900339

Current hierarchy: **John  Ferreira → J & J Materials Corp → J & J MATERIALS CORP.**

- 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:** Capaldi Brothers Corp → J & J MATERIALS CORP.; 1950-01-01 to 1992-06-05; source msha-controller-operator-history
- **controller_controls_mine:** Capaldi John F → J & J MATERIALS CORP.; 1950-01-01 to 1992-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Capaldi John F → Capaldi Brothers Corp; 1950-01-01 to 1992-06-05; source msha-controller-operator-history
- **controller_controls_mine:** BTR PLC → J & J MATERIALS CORP.; 1979-04-23 to 1996-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Tilcon Capaldi Inc → J & J MATERIALS CORP.; 1992-06-06 to 1996-09-10; source msha-controller-operator-history
- **controller_controls_operator:** BTR PLC → Tilcon Capaldi Inc; 1992-06-06 to 1996-09-10; source msha-controller-operator-history
- **operator_operates_mine:** J & J Materials Corp → J & J MATERIALS CORP.; 1996-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Ferreira → J & J MATERIALS CORP.; 1996-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Ferreira → J & J Materials Corp; 1996-09-11 to current/open; source msha-controller-operator-history