# Relationship history for MSHA mine 3401663

Current hierarchy: **Joe  Quigley → Sintertec-Div/BPI Inc → SINTERTEC DIV OF BPI INC**

- 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:** Refractory Materials Inc → SINTERTEC DIV OF BPI INC; 1989-01-01 to 1994-03-31; source msha-controller-operator-history
- **controller_controls_mine:** J H  Curran → SINTERTEC DIV OF BPI INC; 1989-01-01 to 1994-03-31; source msha-controller-operator-history
- **controller_controls_operator:** J H  Curran → Refractory Materials Inc; 1989-01-01 to 1994-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Sintertec-Div/BPI Inc → SINTERTEC DIV OF BPI INC; 1994-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joe  Quigley → SINTERTEC DIV OF BPI INC; 1994-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe  Quigley → Sintertec-Div/BPI Inc; 1994-04-01 to current/open; source msha-controller-operator-history