# Relationship history for MSHA mine 4406502

Current hierarchy: **Rogers Group Inc → Rogers Group Inc. → Starkey Lime Plant**

- 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:** Rogers Group Inc → Starkey Lime Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David D  Willis → Starkey Lime Plant; 1950-01-01 to 2016-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Rockydale Quarries Corporation → Starkey Lime Plant; 1989-03-01 to 2026-06-07; source msha-controller-operator-history
- **controller_controls_operator:** David D  Willis → Rockydale Quarries Corporation; 1989-03-01 to 2016-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Willis Trust et al → Starkey Lime Plant; 2016-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Willis Trust et al → Rockydale Quarries Corporation; 2016-05-18 to 2026-06-07; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Group Inc. → Starkey Lime Plant; 2026-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group Inc.; 2026-06-08 to current/open; source msha-controller-operator-history