# Relationship history for MSHA mine 4604659

Current hierarchy: **Frye Roger → Bristol Mining Inc → Berlin #1 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

- **operator_operates_mine:** Lehigh Corp → Berlin #1 Mine; 1975-07-01 to 1980-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Blake Ray E Jr → Berlin #1 Mine; 1975-07-01 to 1980-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Blake Ray E Jr → Lehigh Corp; 1975-07-01 to 1980-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Lehigh Corp → Berlin #1 Mine; 1980-04-29 to 1983-10-11; source msha-controller-operator-history
- **controller_controls_mine:** Summerfield A W → Berlin #1 Mine; 1980-04-29 to 1983-10-11; source msha-controller-operator-history
- **controller_controls_operator:** Summerfield A W → Lehigh Corp; 1980-04-29 to 1983-10-11; source msha-controller-operator-history
- **operator_operates_mine:** Bristol Mining Inc → Berlin #1 Mine; 1983-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frye Roger → Berlin #1 Mine; 1983-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frye Roger → Bristol Mining Inc; 1983-10-12 to current/open; source msha-controller-operator-history