Positions for fixed industrial equipment operators in Federal service at National Institutes of Health, Bethesda, Md., Atomic Energy Commission, Germantown, Md., David Taylor Model Basin, Carderock, Md., National Naval Medical Center, Bethesda, Md., Naval Ordnance Laboratory, White Oak, Silver Spring, Md. and any other Federal establishment located in Montgomery County, Md., for which no other examination is specifically announced, announcement B-30-l(61).