# Relationship history for MSHA mine 4605662

Current hierarchy: **Graybeal Carl N & Jack L Williams → Tamroy Mining Inc → Tamroy No 1 Deep Mine**

- 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:** Lancianese John → Tamroy No 1 Deep Mine; 1974-07-01 to 1980-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Tamroy Mining Inc → Tamroy No 1 Deep Mine; 1977-11-01 to 1980-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Lancianese John → Tamroy Mining Inc; 1977-11-01 to 1980-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Tamroy Mining Inc → Tamroy No 1 Deep Mine; 1980-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Graybeal Carl N & Jack L Williams → Tamroy No 1 Deep Mine; 1980-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graybeal Carl N & Jack L Williams → Tamroy Mining Inc; 1980-08-04 to current/open; source msha-controller-operator-history