# Relationship history for MSHA mine 3601781

Current hierarchy: **Ronald  Lickman → International Anthracite Corp → Iac/Refuse Disposal**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Williamson Alfred P → Iac/Refuse Disposal; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wilson Coal Company → Iac/Refuse Disposal; 1950-01-01 to 1976-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Wilson Coal Company → Iac/Refuse Disposal; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilson Coal Company → Wilson Coal Company; 1950-01-01 to 1976-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Williamson Coal Company Inc → Iac/Refuse Disposal; 1976-02-11 to 1979-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Williamson Alfred P → Williamson Coal Company Inc; 1976-02-11 to 1979-06-17; source msha-controller-operator-history
- **operator_operates_mine:** G M P Land Company Inc → Iac/Refuse Disposal; 1979-06-18 to 1980-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Goos Karl F → Iac/Refuse Disposal; 1979-06-18 to 1991-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Goos Karl F → G M P Land Company Inc; 1979-06-18 to 1980-04-11; source msha-controller-operator-history
- **operator_operates_mine:** International Anthracite Corp → Iac/Refuse Disposal; 1980-04-12 to 1988-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Total Compagnie Francaise Des Petroles → Iac/Refuse Disposal; 1980-04-12 to 1988-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Total Compagnie Francaise Des Petroles → International Anthracite Corp; 1980-04-12 to 1988-07-14; source msha-controller-operator-history
- **operator_operates_mine:** International Anthracite Corp → Iac/Refuse Disposal; 1988-07-15 to 1991-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Sunnyside Mines Inc → Iac/Refuse Disposal; 1988-07-15 to 1991-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Sunnyside Mines Inc → International Anthracite Corp; 1988-07-15 to 1991-04-25; source msha-controller-operator-history
- **operator_operates_mine:** International Anthracite Corp → Iac/Refuse Disposal; 1991-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald  Lickman → Iac/Refuse Disposal; 1991-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Lickman → International Anthracite Corp; 1991-04-26 to current/open; source msha-controller-operator-history