# Relationship history for MSHA mine 4404043

Current hierarchy: **Smith David → Snowball Coal Corp → No 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

- **controller_controls_mine:** United  Company → No 1 Mine; 1973-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ted  Osborne Jr → No 1 Mine; 1973-06-01 to 1980-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Whited Clarence → No 1 Mine; 1974-01-01 to 1978-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Triple T Coal Company Inc → No 1 Mine; 1975-04-07 to 1976-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Osborne Jr → Triple T Coal Company Inc; 1975-04-07 to 1976-06-17; source msha-controller-operator-history
- **operator_operates_mine:** P W & W Coal Company Inc → No 1 Mine; 1976-06-18 to 1978-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Whited Clarence → P W & W Coal Company Inc; 1976-06-18 to 1978-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp No 6 → No 1 Mine; 1978-02-10 to 1980-05-31; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp No 6; 1978-02-10 to 1980-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Snowball Coal Corp → No 1 Mine; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith David → No 1 Mine; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith David → Snowball Coal Corp; 1980-06-01 to current/open; source msha-controller-operator-history