Provision of information relating to the selection of sewage disposal apparatus, septic tanks, cesspools being part of sanitary installations, interceptors being parts of drainage installations for the intercepting and storing of polluted surface water, and apparatus for the biological treatment of sewage; the design of sewage disposal apparatus, septic tanks, cesspools being part of sanitary installations, interceptors being parts of drainage installations for the intercepting and storing of polluted surface water, and apparatus for the biological treatment of sewage; all included in Class 42.;
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