Joseph B. Jenkins Sr., 76, a retired vice president of the United Insurance Co. and secretary of the Johnson & Jenkins Funeral Home in Washington, died of cardiopulmonary arrest Feb. 19 at the Southern Maryland Hospital in Clinton.

Mr. Jenkins, an Upper Marlboro resident, was born in Eastover, S.C. He moved to Washington in 1931 and attended the old Miner Teachers College. He began his career at the United Insurance Co. in 1941 and retired in 1979.

He was named secretary of the Johnson & Jenkins Funeral Home in 1939, when his late brother, Fred D. Jenkins, helped found it. He continued in that postion until his death.

Mr. Jenkins was a member of the St. Phillips Baptist Church in Washington and of the Ebony Fishing Club.

His first wife, the former Mabel Jennings, died in the late 1930s.

Survivors include his wife, Helen W. Jenkins of Upper Marlboro; one son by his first marriage, Joseph B. Jenkins Jr. of Washington; one sister, Susie J. Coleman of Jacksonville; two grandchildren, and three great-grandchildren.


Washington Hotelier

Robert Deminieu Blackistone, 84, who formerly owned and operated the Carroll Arms and the Plaza hotels in Washington, died of cancer Feb. 18 at his home in St. Petersburg, Fla.

Mr. Blackistone was born at "River Springs," a St. Mary's County, Md., home that had been in his family for six generations. He graduated from Charlotte Hall Military Academy in St. Mary's County and he attended the University of Maryland.

He was in the Washington hotel business for 40 years before retiring in 1966, and most recently had owned and operated the Carroll Arms and the Plaza hotels on Capitol Hill. Earlier he had managed the New Colonial and Lafayette hotels.

He was a former director of the First National Bank of St. Mary's and a member of the St. Mary's County Board of Education, the B.B. French lodge of the Scottish Rite, the Shrine, the Southern Maryland Society and the University of Maryland's Terrapin Club and M Club.

Upon his retirement, Mr. Blackistone moved from Washington to St. Petersburg.

Survivors include his wife, Katherine Porter Blackistone, and one daughter, Marguerite Blackistone, both of St. Petersburg; and one sister, Jean Blackistone Hughes of Pittsburgh.


Nursing Coordinator

Ruth Walker Randolph, 62, retired coordinator of the post-secondary practical nursing program at M.M. Washington Vocational High School in Washington, died of cancer Feb. 20 at her home in Washington.

Mrs. Randolph was born in Washington and graduated from Dunbar High School. She studied nursing at New York University and she had bachelor's degrees in education from D.C. Teachers College and Howard University.

Before going to work for D.C. public schools in 1952, she worked for the D.C. Visiting Nurse Association and Freedman's Hospital. She had worked as a school nurse and had taught nursing in public schools.

Mrs. Randolph retired in 1980.

She was a member of the Catholic Church of the Nativity in Washington.

Survivors include her husband of 40 years, Nathaniel Randolph of Washington; three daughters, Constance A. Randolph, Jacquelyn G. Randolph and Mary R. Randolph, all of Washington; three sons, Nathaniel Randolph Jr. of Washington, Dr. Michael A. Randolph of Takoma Park and Bruce C. Randolph of Los Angeles; one brother, Emmett C. Walker of Washington; and one grandchild.


Undersea Warfare Expert

James J. Cavener, 57, the founder, president and chief executive officer of Techno Systems, an Alexandria-based firm specializing in antisubmarine warfare projects, died of cancer Feb. 21 at his home in Alexandria.

Mr. Cavener was born in Canal-Winchester, Ohio. He graduated from Louisiana State University with a degree in electrical engineering. He served in the Air Force from 1949 to 1953.

Before moving to the Washington area in 1977 Mr. Cavener worked for Magnavox in Fort Wayne, Ind.

Before he founded Techno Systems in 1982, he worked for the Crystal City-based Energystics Corp., a defense contracting firm he also helped found.

His marriage to Hazel Joyce Cavener ended in divorce.

Survivors include his wife, Cheryl Deanne Cavener of Alexandria, and three daughters by his first marriage, Deirdre White of Seminole, Fla., Kimbre Gledhill of Folsom, Pa., and Robin Cavener of Springfield.


Volunteer at VA

Beatrice Locke Hogan, 93, who served as chairwoman of voluntary services for the Veterans Administration during the 1950s, died of pneumonia Feb. 20 at the Chevy Chase House retirement home in Washington.

Mrs. Hogan, a 35-year resident of Silver Spring, was born in Portland, Ore., and she graduated from the University of Oregon. From 1917 to 1940 she was society editor of the Spectator, a society newspaper in Portland.

She was national commander of the Disabled American Veterans Auxiliary in 1945-46.

In 1949 Mrs. Hogan moved to the Washington area from Cincinnati.

She was a member of the PEO Sisterhood and the National Presbyterian Church.

Her husband, Cicero F. Hogan, died in 1981.

There are no immediate survivors.


Transportation Researcher

Ralph A. Hafner, 82, a retired official of Research Analysis Corp. and a former employee of the Army, where he helped develop ground transportation in the Arctic and in Greenland, died of cancer Feb. 12 at his home in Rockville.

Mr. Hafner was born in Philadelphia. He graduated from American University and he attended Johns Hopkins University. During World War II he served in the Army in the Philippines. He remained in the Army Reserves until 1960, when he retired as a lieutenant colonel.

Mr. Hafner worked for the Philadelphia traffic department before moving to the Washington area in 1953 and going to work for the Army Transportation Corps. He joined the Research Analysis Corp. in 1959 and retired in 1970 as an operations research analyst.

His marriage to the former Laura Schempp ended in divorce.

Survivors include his wife, M. Leota Hafner of Rockville; one child by his first marriage, Laura M. Notarianni of Philadelphia; three stepchilden, M. Louise Pavlovic of Rockville, Richard L. Owens of Bothell, Wash., and J. Clark Owens of Arlington, Wash.; one brother, Arthur B. Hafner of Malvern, Pa.; nine grandchildren, and one great-grandchild.