ELM 55 - Employee and Labor Relations Manual - Contents 690 Inventions and Patents 691 Policy It is a policy of the Postal Service to encourage and stimulate the inventive talents of employees and to determ..." /> ELM 55 - Employee and Labor Relations Manual - Contents 690 Inventions and Patents 691 Policy It is a policy of the Postal Service to encourage and stimulate the inventive talents of employees and to determ..." />