The phrase "a long established relationship" is correct and usable in written English.
It can be used to describe a relationship that has existed for a significant period of time, often implying stability and familiarity.
Example: "The two companies have maintained a long established relationship, which has benefited both parties over the years."
Alternatives: "a well-established relationship" or "a long-standing relationship."
Cornell University, the SC Johnson College of Business has long established relationships with many major employers, including professional service firms, consulting firms, banks and fortune 500 companies across a broad range of industries.
Cornell University, the SC Johnson College of Business and the Accounting program have long established relationships with many major employers, including professional service firms, consulting firms, banks and fortune 500 companies.
Do you maintain a list of preferred security vendors, forensic analysts, security consultants, etc. for clients to use? Marsh has long established relationships with security consultants on whom we rely to keep updated of current threats so that we can appreciate threat environments and educate our clients.
Many patients have long established relationships with their GP and therefore may consult them for advice in-between specialist appointments or upon completion of surgery or other adjuvant treatments.
That would mean exchanging long- established relationships with U.S. partners for others who are not so well known to the Chinese.
Several practices often share a local case manager with whom they have a long-term established relationship.
Always invite both halves of couples who are in a long-term, established relationship, or who are living together, or who are engaged (it is good form to take the time to find out their names so you avoid writing "and guest" on the invitations).
Given its strong relationship to the occurrence of inadequate tissue oxygenation and its long-time established relationship with morbidity and mortality, lactate levels could represent a useful goal of initial resuscitation in many clinical conditions.
"They have a long-established relationship with paternal grandmother and are comfortable in her care".
