U.S. patents available from 1976 to present.
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Icon_funbox Did You Know...

...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!

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Class 172/512 - Inverted U-shape


Subclass of Class 172 - Earth working
Definition: Apparatus in which said means comprises an inverted U- or
No. of patents: 5
Last issue date: 10/14/1997


NumberTitleIssue Date
5676211Adjustable tunnel shield structure
A relatively short tunnel shield is connected to a light weight floating arm including a first tube telescopingly received within a second tube. Multiple holes in the double tube arm allow optimum positioning of the shield relative to a ground engaging el...
10/14/1997
4282936Quick acting coupler for cultivator attachment
A quick acting coupler for a cultivator attachment, such as a cultivator fender, shield, or the like, in which the attachment is carried by a mounting frame with the latter being securable to the tool or cultivator bar of a cultivator implement for coupli...
08/11/1981
4171725Rotary harrow
Improvements in rotary harrows whereby an odd number of soil-working members are rotatably journalled thereon, the members having an even number on each side of a gear box located over one of the members, the gear box being in driving engagement with mech...
10/23/1979
4074447Stump cutting and precision digging apparatus
A stump cutter and earth ripper device having a balanced channel frame chassis, the device including a forward centrally disposed cutting wheel having a plurality of radially extending cutting teeth circumferentially mounted thereon. The frame is supporte...
02/21/1978
4026366Plant fender or guard for cultivators
A floating plant guard or fender for cultivators formed of rod components straddles small plants in rows and prevents the plants from being damaged or buried by the action of the cultivator tines in the soil. The plant guards are wider at the front than a...
05/31/1977
 
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