> as lemmas

1938 F. A. Lindemann 8 Mar. in R. V. Jones Most Secret War (1978) iv. 40 Lest too much reliance be placed upon the R.D.F. methods, it is perhaps worth pointing out that certain difficulties may easily be encountered in actual use.

1942 E. Waugh Put out More Flags i. 28 We've got a most valuable invention called R.D.F.

1942 E. Waugh Put out More Flags i. 28 The German air-bases are too far away for them to be able to attack us. If they do, we'll R.D.F. them out of the skies.

1975 S. Johnson Urbane Guerilla iii. 147 We didn't RDF him... The trouble is RDF-ing, radar direction finding, requires a cross-bearing.

1990 Small Boat Jrnl. Jan. 28/2 More sophisticated navigational electronics—depthsounder, RDF, loran, radar, satnav—are fun to have and can be helpful.

2001 Chesapeake Bay Mag. Oct. 62/2 If you remember homing in on low-frequency beacons, you may know these transmitter sites as the old Coast Guard RDF system.

1979 Washington Post 20 Dec. a22/1 The planned 110,000-member Rapid Deployment Force (RDF) has been discussed frequently in recent weeks.

2004 F. A. Boyle Destroying World Order i. 40 Even with a creditable RDF the United States could not by itself successfully defend Iranian oil fields.

1974 Post Standard (Syracuse, N.Y.) 1 June 6/6 RDF, when burned, will generate about half the BTU's..of coal.

1991 Atom Jan. 13 (caption) Refuse derived fuel (RDF) from the combustible materials mechanically removed from the waste can be made into these pellets.

2003 H. L. Hickman Amer. Alchemy vii. 260 RDF is an important part of the total integrated solid waste management strategy.