# Relationship history for MSHA mine 0501016

Current hierarchy: **Skanska AB → Skanska USA Civil West RMD → El Jay Double Cone #2**

- 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:** Nielsons Inc → El Jay Double Cone #2; 1950-01-01 to 1980-03-24; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → El Jay Double Cone #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Nielsons Inc; 1950-01-01 to 1980-03-24; source msha-controller-operator-history
- **controller_controls_mine:** Nielsons Holding Company → El Jay Double Cone #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nielsons Inc → El Jay Double Cone #2; 1980-03-25 to 1995-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Nielsons Holding Company → Nielsons Inc; 1980-03-25 to 1995-09-04; source msha-controller-operator-history
- **operator_operates_mine:** Nielsons Inc → El Jay Double Cone #2; 1995-09-05 to 1998-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → El Jay Double Cone #2; 1995-09-05 to 1998-04-07; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Nielsons Inc; 1995-09-05 to 1998-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Nielsons Inc → El Jay Double Cone #2; 1998-04-08 to 2008-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Skanska AB → El Jay Double Cone #2; 1998-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Skanska AB → Nielsons Inc; 1998-04-08 to 2008-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Skanska AB → El Jay Double Cone #2; 2001-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Skanska USA Civil West RMD → El Jay Double Cone #2; 2008-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Skanska AB → Skanska USA Civil West RMD; 2008-04-01 to current/open; source msha-controller-operator-history