# Relationship history for MSHA mine 1515726

Current hierarchy: **Collins Roger B → Collins & May Mining Company Inc → No 1 Tipple**

- 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:** Collins Roger B → No 1 Tipple; 1974-12-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lawrence County Coal Company Inc → No 1 Tipple; 1986-08-01 to 1987-02-03; source msha-controller-operator-history
- **controller_controls_mine:** Allen James R → No 1 Tipple; 1986-08-01 to 1987-02-03; source msha-controller-operator-history
- **controller_controls_operator:** Allen James R → Lawrence County Coal Company Inc; 1986-08-01 to 1987-02-03; source msha-controller-operator-history
- **operator_operates_mine:** Collins & May Mining Company Inc → No 1 Tipple; 1987-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collins Roger B → Collins & May Mining Company Inc; 1987-02-04 to current/open; source msha-controller-operator-history