# Relationship history for MSHA mine 4606178

Current hierarchy: **Cobb Richard → Marion Resources Inc → 2a 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:** Keeney Robert H → 2a Mine; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gilmer Coal Contractors Inc → 2a Mine; 1980-08-01 to 1981-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Fisher Quentin R → 2a Mine; 1980-08-01 to 1981-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Fisher Quentin R → Gilmer Coal Contractors Inc; 1980-08-01 to 1981-02-24; source msha-controller-operator-history
- **operator_operates_mine:** Advent Mining Inc → 2a Mine; 1981-02-25 to 1982-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Fisher Jeffrey A Et Al → 2a Mine; 1981-02-25 to 1982-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Fisher Jeffrey A Et Al → Advent Mining Inc; 1981-02-25 to 1982-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Keeney Koal Kompany Inc → 2a Mine; 1982-07-01 to 1986-09-15; source msha-controller-operator-history
- **controller_controls_operator:** Keeney Robert H → Keeney Koal Kompany Inc; 1982-07-01 to 1986-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Marion Resources Inc → 2a Mine; 1986-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cobb Richard → 2a Mine; 1986-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cobb Richard → Marion Resources Inc; 1986-09-16 to current/open; source msha-controller-operator-history