# Relationship history for MSHA mine 1900598

Current hierarchy: **Louise  Landers → P A Landers Inc → Forestdale**

- 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:** Warren Brothers Company Inc → Forestdale; 1950-01-01 to 1979-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Forestdale; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Warren Brothers Company Inc; 1950-01-01 to 1979-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Tilcon Quarries Massachusetts Inc → Forestdale; 1979-04-23 to 1987-05-05; source msha-controller-operator-history
- **controller_controls_mine:** BTR PLC → Forestdale; 1979-04-23 to 1987-05-05; source msha-controller-operator-history
- **controller_controls_operator:** BTR PLC → Tilcon Quarries Massachusetts Inc; 1979-04-23 to 1987-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Gallo Construction Company Inc → Forestdale; 1987-05-06 to 1988-07-14; source msha-controller-operator-history
- **controller_controls_mine:** John  Gallo → Forestdale; 1987-05-06 to 1988-07-14; source msha-controller-operator-history
- **controller_controls_operator:** John  Gallo → Gallo Construction Company Inc; 1987-05-06 to 1988-07-14; source msha-controller-operator-history
- **operator_operates_mine:** P A Landers Inc → Forestdale; 1988-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Louise  Landers et al → Forestdale; 1988-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Louise  Landers et al → P A Landers Inc; 1988-07-15 to current/open; source msha-controller-operator-history