# Relationship history for MSHA mine 3600238

Current hierarchy: **Daniel R  Hawbaker → Centre Lime & Stone Company Inc → Centre Lime & Stone Mines**

- 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:** Marblehead Lime Company → Centre Lime & Stone Mines; 1950-01-01 to 1988-01-25; source msha-controller-operator-history
- **controller_controls_mine:** General Dynamics Corp → Centre Lime & Stone Mines; 1950-01-01 to 1994-05-08; source msha-controller-operator-history
- **controller_controls_operator:** General Dynamics Corp → Marblehead Lime Company; 1950-01-01 to 1988-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Centre Lime & Stone Company Inc → Centre Lime & Stone Mines; 1988-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel R  Hawbaker  et al → Centre Lime & Stone Mines; 1988-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel R  Hawbaker  et al → Centre Lime & Stone Company Inc; 1988-01-26 to current/open; source msha-controller-operator-history