Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 4177867 | Self-drilling dowel with an inclined rolling head A self-drilling dowel consists of a tubular-shaped member with a drilling head at one end. The drilling head is formed of a plurality of teeth each having a tip. The tip of the teeth are all disposed in a single plane inclined at an angle to the axis of t... | 12/11/1979 |
| 4105358 | Support device for pipe driller A support device for a pipe driller and particularly for sewer pipe which eliminates excavation from the underside of the pipe. A support means engages a standard pipe driller and arm members extend from the support. The arm members are pivotally secured ... | 08/08/1978 |
| 4078622 | Road surface recessing device A device is provided for creating recesses for road surface markers in road surfaces which makes initially a cut sufficient to stabilize the device in the desired position and then fragments and discharges core material within a circular cut defining the ... | 03/14/1978 |
| 4073094 | Method and apparatus for repairing a crack in a pane of plate glass A system for repairing a crack in a pane of plate glass in which a rotatable shaft extends through the glass and carries cutters on both sides for concurrently cutting an aperture therein from both sides.... | 02/14/1978 |
| 4056152 | Drill bit for reinforced concrete A rotary bit for drilling concrete and reinforced concrete having a hollow drill stem with a transversely disposed drilling face at its outer end, the face having annularly disposed sawtooth surfaces including abrupt step portions alternating with trailin... | 11/01/1977 |
