# Relationship history for MSHA mine 0505066

Current hierarchy: **Cecil  Farnsworth; Patricia  Farnsworth → Farnsworth Construction & Gravel Co → Cedar Rapids 1**

- 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:** Patricia  Farnsworth et al → Cedar Rapids 1; 1985-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Farnsworth Construction & Gravel Co → Cedar Rapids 1; 2016-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patricia  Farnsworth et al → Farnsworth Construction & Gravel Co; 2016-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cecil  Farnsworth et al → Farnsworth Construction & Gravel Co; 2016-08-15 to current/open; source msha-controller-operator-history