When Jasper R. Dell Hull walked into the Tulsa offices of the Zero Hour Bomb Company in 1947, he carried a piece of plywood with a few nails in a circle wrapped in line. Attached was a coffee-can lid that could spin. Hull, known by his friends as “R.D.,” was an amateur inventor from Rotan, Texas. He had an appointment with executives at the Oklahoma oilfield service company.
Since its incorporation in 1932, the Zero Hour Bomb Company had become well known for manufacturing dependable electric timer bombs for fracturing geologic formations. It had designed and patented technologies for “shooting” wells to increase oil and natural gas production.
The company’s timer controlled a mechanism with a detonator in a watertight casing. The downhole device could be pre-set to detonate a series of blasting caps, which set off the well’s main charge, shattering rock formations.
Hull’s 1947 visit was timely for Zero Hour Bomb Company, because post World War II demand for its electrically triggered devices had declined. With the military no longer needing oil to fuel the war, the U.S. petroleum industry was in recession. The company and other once booming Oklahoma service companies were reeling, and the future did not look good.
“Vast fossil fuel reserves beneath other Middle Eastern nations were being unlocked,” notes journalist Joe Sills in a 2014 article. “OPEC was beginning to take shape, and Texas and Oklahoma-based domestic oil in the U.S. was about to take a decades-long backseat to foreign oil.”
Further, with company patents expiring in 1948, “the Zero Hour Bomb Company needed a solution,” explains Sills, digital editor for Fishing Tackle Retailer. After examining Hull’s contraption, a prototype fishing reel, the company hired him for $500 a month. Hull later received a patent that would transform Zero Hour Bomb Company – and sport fishing in America.
Downhole Patents and a Fishing Reel
Beginning in the early 1930s, Zero Hour Bomb engineers patented many innovative oilfield products. A 1939 design for an “Oil Well Bomb Closure” facilitated assembly of an explosive device capable of withstanding extreme pressures submerged deep in a well. A 1940 invention provided a hook mechanism for safely lowering torpedoes into wells. The locking method was to “positively prevent premature release of the torpedo while it is being lowered into the well.”
A 1941 patent improved positioning blasting cartridges with a canvas plugging device that looked like an upside-down umbrella. The “well bridge” automatically opened “when the time bomb or weight reached a position at the bottom of the well.”
A 1953 design that took this concept even further would be the last patent Zero Hour Bomb received as an oilfield equipment manufacturer. By then, the earliest model of Hull’s new “cannot backlash” reel was attracting crowds at sports shows.
“After trying to design ‘brakes’ for bait-casting reels, and even failing at launching one fishing reel company, Hull hit on a better way one day as he watched a grocery store clerk pull string from a large fixed spool to wrap a package,” reports Lee Leschper in a 1999 Amarillo Globe-News article.
Hull realized he needed a cover to keep the line from spinning off the reel itself and soon developed a prototype, Leschper notes. “Zero Hour officials asked two company employees who were avid fishermen for their opinions on the reel. One tied his set of car keys to the end of the line and sent a cast flying through one of the windows in the plant. The other sent a cast high over the building. All were impressed.”
Given his own Hull-desiged fishing reel at about age six, Leschper recalls the “tiny black pushbutton reel” came with 6 lb. monofilament line (a petroleum-based polymer), a four-foot white hollow fiberglass rod, and a hard yellow plastic practice plug.
It is even possible the plug was made from Marlex, a revolutionary plastic invented at Phillips Petroleum Company in Bartlesville, 45 miles north of Tulsa (see Petroleum Product Hoopla). Leschper adds that “I wore it down to a nub pitching it across the hard-baked grass in our front yard.”
Earlier, Hull, had tested several designs before developing a production process; the first reel was produced on May 13, 1949. Called the Standard, it made its public debut at a Tulsa sports expo in June. By 1954, the reel’s simple push-button system used today was introduced.
The regional marketing name – Zebco – became popular, but the bottom of each reel’s foot was stamped with the the name of the manufacturer, Zero Hour Bomb Company. The official name change to Zebco came in 1956, soon after a friend of President Dwight D. Eisenhower asked the company to send a reel to the president.
According to a Zebco company history, when White House security officers saw the package labeled “Zero Hour Bomb Company,” they plunged it into a tub of water and called the bomb squad. After changing its name to Zebco, the company left the oilfield for good.
In 1961, Zebco was acquired by Brunswick Corporation and introduced the 202 ZeeBee spincast, “an instant classic.” After shifting reel assembly production to China in 2000, Brunswick a year later sold Zebco to the W.C. Bradley Company. Zebco headquarters today remains in Tulsa, where it leases a 200,000-square-foot warehouse and distribution center.
Jasper R. Dell “R.D.” Hull was inducted into the Sporting Goods Industry Hall of Fame in 1975 after receiving more than 35 patents. At the time of his induction, 70 million Zebco reels had been sold. He retired from the former oilfield time-bomb company in January 1977 after being diagnosed with cancer and died in December at age 64.
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