![Post Office box wheatstone bridge for line and other resistance measurements | Science Museum Group Collection Post Office box wheatstone bridge for line and other resistance measurements | Science Museum Group Collection](https://coimages.sciencemuseumgroup.org.uk/images/362/84/medium_SMG00181758.jpg)
Post Office box wheatstone bridge for line and other resistance measurements | Science Museum Group Collection
![Royal Mail wants to trial super-sized 'parcel boxes' in Walsall so people can avoid the Post Office - Birmingham Live Royal Mail wants to trial super-sized 'parcel boxes' in Walsall so people can avoid the Post Office - Birmingham Live](https://i2-prod.birminghammail.co.uk/incoming/article18453996.ece/ALTERNATES/s1200c/0_Parcel-Box.png)
Royal Mail wants to trial super-sized 'parcel boxes' in Walsall so people can avoid the Post Office - Birmingham Live
![A Royal Mail post box next to a stamps vending machine in Windsor, Berkshire, UK, Stock Photo, Picture And Rights Managed Image. Pic. YT7-1437802 | agefotostock A Royal Mail post box next to a stamps vending machine in Windsor, Berkshire, UK, Stock Photo, Picture And Rights Managed Image. Pic. YT7-1437802 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/ef207fa44e6ee47f435c0939d0a7468c/yt7-1437802.jpg)
A Royal Mail post box next to a stamps vending machine in Windsor, Berkshire, UK, Stock Photo, Picture And Rights Managed Image. Pic. YT7-1437802 | agefotostock
![Royal Mail wants to trial super-sized 'parcel boxes' in Walsall so people can avoid the Post Office - ROYALMAILCHAT Royal Mail wants to trial super-sized 'parcel boxes' in Walsall so people can avoid the Post Office - ROYALMAILCHAT](https://i2-prod.birminghammail.co.uk/incoming/article18453962.ece/ALTERNATES/s615b/0_Parcel-box.png)