Martin Gilliard

Bumpers with built-in hitches for trailer hauling. Add-on hitches are unsightly and make it hard to get a push in an emergency. F.M. Maguire, Savannah

Designed for a small sports car bucket seat or better still to fit between the two seats, saddled over the hump. – Mrs. Carol G. Donahue, West Andover, Mass.

Although doesn’t look too safe to me!

Trim that hard to cut long grass with extendable fingers at the sides of power lawnmowers. Tallgrass close to the house or garden beds would be guided into the path of the blade. – Dr. L.A. Russell, Newtonville, Mass.

Chemically treated netting, dyed green. Ideal for supporting vegetable vines. At the end of the season, it could be thrown on the compost pile to aid decomposition. G. Jorgenson, Tacoma

Is your dive too dark then you need this idea for underwater spotlights on skin-diving masks? A working light like a miner’s lamp would be out of the way where it wouldn’t impede the diver. – K.H. Schroeder, Westmont, N.J.

Let your kids have a bath in a shower with a shower bathtub – a deep, poly-plastic liner with a drain to fit inside shower stalls. Fine for bathing the kids in motels. hotels or summer cottages that don’t have bathtubs. – T.B. Ellis, Trenton, N.J.

Spring-loaded nail feeders – as each nail popped into the final position, a shaft or anvil would drop on the head. Pound it down and it would set the nail too. – J. Myers, Sylvania, Ohio

Fountain stamps with porous letters and a refillable ink reservoir. Clerks who stamp hundreds of forms daily wouldn’t waste motion swatting at a pad. – H. M. Monaghan, N.Y.

Quick-frozen lunches in disposable cartons – a boon to the sandwich detail. Pop them into the schoolbags in the morning and they’d thaw by noon. – Mrs. E. Miller, Lansing, Mich.

Light-reflecting trim on the sides of cars, designed to be part of the standard trim. Luminous plastic edging the chrome might do the job. – David F. Tufaro, Hartsdale, N.Y.