Which company started the earliest the maintenance contract? Show the company name.
SELECT T1.company_name FROM Third_Party_Companies AS T1 JOIN Maintenance_Contracts AS T2 ON T1.company_id  =  T2.maintenance_contract_company_id ORDER BY T2.contract_start_date ASC LIMIT 1
SELECT T1.company_name FROM Third_Party_Companies AS T1 JOIN Maintenance_Contracts AS T2 ON T1.company_id  =  T2.maintenance_contract_company_id ORDER BY T2.contract_start_date ASC LIMIT 1
[{'company_name': 'Grimes, Mosciski and Renner'}]