# Relationship history for MSHA mine 1700511

Current hierarchy: **Lane Industries Inc → Sunrise Materials-Div/Lane Construction Corp → PORTABLE MILL**

- 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

- **controller_controls_mine:** James G  Sargent → PORTABLE MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H E Sargent Inc → PORTABLE MILL; 1980-05-01 to 1987-12-31; source msha-controller-operator-history
- **controller_controls_operator:** James G  Sargent → H E Sargent Inc; 1980-05-01 to 1987-12-31; source msha-controller-operator-history
- **operator_operates_mine:** H E Sargent Inc → PORTABLE MILL; 1988-01-01 to 1994-08-07; source msha-controller-operator-history
- **controller_controls_mine:** BILFINGER BERGER AG → PORTABLE MILL; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** BILFINGER BERGER AG → H E Sargent Inc; 1988-01-01 to 1994-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Sunrise Materials-Div/Lane Construction Corp → PORTABLE MILL; 1994-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lane Industries Inc → PORTABLE MILL; 1994-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lane Industries Inc → Sunrise Materials-Div/Lane Construction Corp; 1994-08-08 to current/open; source msha-controller-operator-history