# Relationship history for MSHA mine 1700092

Current hierarchy: **Dyer Ralph A & Charles Entenmann → World Minerals Corp → Industrial Garnet**

- 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:** Oxford Feldspar & Mineral Corp → Industrial Garnet; 1950-01-01 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Oxford Feldspar & Mineral Corp → Industrial Garnet; 1950-01-01 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Oxford Feldspar & Mineral Corp → Oxford Feldspar & Mineral Corp; 1950-01-01 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_mine:** O'Connor Michael P → Industrial Garnet; 1978-03-09 to 1987-01-12; source msha-controller-operator-history
- **operator_operates_mine:** Industrial Garnet Extractives Inc → Industrial Garnet; 1978-12-01 to 1987-01-12; source msha-controller-operator-history
- **controller_controls_operator:** O'Connor Michael P → Industrial Garnet Extractives Inc; 1978-12-01 to 1987-01-12; source msha-controller-operator-history
- **operator_operates_mine:** World Minerals Corp → Industrial Garnet; 1987-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dyer Ralph A & Charles Entenmann → Industrial Garnet; 1987-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dyer Ralph A & Charles Entenmann → World Minerals Corp; 1987-01-13 to current/open; source msha-controller-operator-history