On October 6, 1831, E. N. Sherr received U.S. Patent No. X6788 on a Guitar:

Sherr’s guitar was really big. However, it was far from the largest guitar. According to the Guiness Book of World Records, the largest playable acoustic guitar is one measuring 16.75 m (59 ft 11 in) long, 7.57 m (24 ft 10 in) wide and 2.67 m (8 ft 9 in) deep (the box of the guitar can easily accomodate 20 people). It was built by Realizarevents, of Porto, Portugal, and weighs four tons (8,818 lb). It took 50 people more than 10 months to complete.

According to that same source, the world’s largest electric guitar is petite by comparison, measuring a measly 13.29 m (43 ft 7.5 in) tall, 5.01 m. (16 ft 5.5 in) wide and weighing 907 kg (2,000 lb). It is modelled on a 1967 Gibson Flying V and built to a scale of 1:12 by students from Conroe Independent School District Academy of Science and Technology, Conroe, Texas, USA at a cost of US$3,000. |Construction began in October 1999, and it was played on June 6, 2000.

On October 3, 1967, U.S. Patent No. D208849 issued to James D. Smth and Rober C. Flint on a Sign:

The sign in question was the Flint’s Hamburger sign, a hamburger chain with multiple locations in Ohio, and at least one North Carolina location, although none of the locations have survived..

The sign was topped with a neon-lot Roto-sphere, an icon of the 1960’s, although it was not part of the design as it is shown in dashed lines. Only about 200 Roto-spheres were made, and unlike FIlnt’s, at least a few survive:

On October 2, 1979, Richard E, Meyer and Pierre Dinand received U.S. Patent Nos. D283035 and D283036 each on a Combined Bottle and Cap:

These were assigned to Jovan, and those of us who were around in the late ’70’s and early ’80’s will remember these interfitting Jovan cologne bottles:

Advertised as part of a timeless generation of fragrances:

the line was discontinued, and today matching sets are considered rare vintage collector’s items.