# Relationship history for MSHA mine 4604109

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

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