# Relationship history for MSHA mine 0402649

Current hierarchy: **Venture Chemicals Inc → Rosamond Minerals Inc → Rosamond Minerals Incorporated**

- 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:** Calcite Corp → Rosamond Minerals Incorporated; 1950-01-01 to 1983-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Diversified Earth Sciences Inc → Rosamond Minerals Incorporated; 1950-01-01 to 1983-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Diversified Earth Sciences Inc → Calcite Corp; 1950-01-01 to 1983-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Mahoney Stanford R → Rosamond Minerals Incorporated; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** All Minerals Corp → Rosamond Minerals Incorporated; 1983-08-04 to 1987-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Mahoney Stanford R → All Minerals Corp; 1983-08-04 to 1987-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Rosamond Minerals Inc → Rosamond Minerals Incorporated; 1987-04-21 to 1989-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Robert H → Rosamond Minerals Incorporated; 1987-04-21 to 1989-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Robert H → Rosamond Minerals Inc; 1987-04-21 to 1989-07-25; source msha-controller-operator-history
- **operator_operates_mine:** Rosamond Minerals Inc → Rosamond Minerals Incorporated; 1989-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Venture Chemicals Inc → Rosamond Minerals Incorporated; 1989-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Venture Chemicals Inc → Rosamond Minerals Inc; 1989-07-26 to current/open; source msha-controller-operator-history